Southwest Florida Plumbing Glossary

Why a local plumbing glossary

Plumbing vocabulary changes by region. Up north, people talk about basements, frost-free spigots and boilers. Here it’s slab leaks, reclaimed water, lift stations and septic conversions, plus a list of pipe materials that depends on which decade your house was built in. Inspection reports, utility letters and condo board packets use these words without explaining them.

Terms are grouped by letter below. Each definition is short and says why the term matters in Lee, Charlotte and Collier Counties. Where we have a full page on a topic, we link it.

A to C

Aerator

The small screen at the tip of a faucet that mixes air into the stream. Around here, aerators clog with calcium flakes from hard water and with sediment that breaks loose after a utility flushes its mains or lifts a boil-water notice. If one faucet suddenly runs weak while the rest of the house is fine, unscrew the aerator and rinse it before assuming the worst. Weak flow everywhere is a different problem, usually pressure or pipe related.

Angle stop

The small shutoff valve where a sink, toilet or faucet supply line comes out of the wall or floor, named for its 90-degree body. Plenty of homes built here in the 1980s and 1990s still have multi-turn compression stops with rubber washers that harden over time. Turn one that hasn’t moved in a decade and it may weep or refuse to close. We usually swap them for quarter-turn stops during a faucet repair or toilet job.

Anode rod

A metal rod, usually magnesium or aluminum, that hangs inside a tank water heater and corrodes on purpose so the steel tank doesn’t. Softened water wears anodes faster than untreated water. Once the rod is eaten down to its core wire, the tank starts rusting. If only your hot water smells like rotten eggs, the magnesium anode reacting with sulfur bacteria is a common cause, especially on wells. A different anode type often fixes it. More on water heaters.

Backflow preventer

An assembly that stops water on your property from flowing back into the public main. Irrigation systems, fire lines and many commercial connections need one, and utilities across Lee, Collier and Charlotte Counties generally require testable assemblies to be tested on a schedule, typically once a year, with results filed with the utility. The reduced pressure zone (RPZ) assembly is the type you’ll see on higher-hazard connections. See backflow testing and repair.

Ball valve

A valve with a drilled ball inside that opens or closes with a quarter turn. Handle in line with the pipe means open; handle across the pipe means closed. Most newer Southwest Florida homes have a ball valve as the main shutoff, often in the garage or on an outside wall. They’re far more dependable than old gate valves, which can snap internally the one day you actually need them.

Cast iron

Heavy iron drain and sewer pipe found under the slab in many local homes built before PVC took over around the 1970s and early 1980s. It corrodes from the inside, the bottom of the pipe wears thin, and scale catches paper and grease. Repeat clogs, sewer odor and a camera image showing a groove along the pipe floor are the usual signs. Our cast iron drain guide covers how it fails.

Check valve

A one-way valve that lets water move in only one direction. You’ll find them on well systems, on sewage ejector discharge lines and in some water meters. A failed check valve on a well lets the pressure tank drain back down the well, so the pump runs too often or loses prime. On an ejector basin, a bad one lets sewage fall back into the pit after every cycle.

Cleanout

A capped access fitting on a drain or sewer line that lets a plumber run a cable, jetter or camera without pulling a toilet. In most homes here the main cleanout is outside near the foundation or in the yard, usually a 3- or 4-inch white PVC cap at ground level. Landscapers bury them under mulch and pavers all the time. Find yours before a backup, because it’s where main line drain cleaning starts.

CPVC

Chlorinated PVC, a rigid cream or tan plastic supply pipe joined with solvent cement. A lot of Southwest Florida homes built or repiped in the 1990s and 2000s used it. CPVC handles hot water, but it turns brittle with age and attic heat, and old lines can crack when someone bumps them during other work. Fittings near the water heater tend to fail first. Brittle CPVC is one of the most common reasons people ask us about whole-house repiping.

Chloramine

A disinfectant made by combining chlorine and ammonia. Many public water utilities use it because it lasts longer in the pipes than chlorine alone. It’s fine to drink, but it’s tougher on some rubber parts like toilet flappers, and it has to be removed for fish tanks and home dialysis. Standard carbon filters don’t remove it well; catalytic carbon does a better job. Your utility’s annual water quality report tells you which disinfectant it uses.

CSST

Corrugated stainless steel tubing, the flexible gas line usually wrapped in a yellow or black jacket. It’s quick to run through attics for ranges, generators and pool heaters, so it shows up in a lot of newer homes here. Manufacturer instructions and the fuel gas code call for it to be bonded to the home’s electrical grounding, because a nearby lightning strike can arc through unbonded tubing. With Florida’s lightning, that bonding is worth checking. See gas line plumbing.

D to H

Dielectric union

A fitting that joins two different metals, usually copper and galvanized steel, with an insulating gasket between them so they don’t corrode each other. You’ll see them on older water heater connections. Without one, galvanic corrosion eats the steel side until the joint leaks or chokes with rust. Some plumbers prefer brass nipples here, since dielectric unions can narrow with scale in hard water.

Drainfield

The bed of perforated pipe and gravel or plastic chambers behind a septic tank, where liquid from the tank soaks into the soil. In Lehigh Acres, Alva and other septic areas, the water table rises in the rainy season. A saturated drainfield can leave toilets slow and gurgling all summer, then seem fine by winter. Soggy ground or extra-green grass over the field are warning signs. Our Lehigh Acres wells and septic guide goes deeper.

DWV

Drain, waste and vent: the gravity system that carries wastewater out of the house and lets air in so it flows. In most local homes built since the 1980s, DWV is white Schedule 40 PVC. Older homes may have cast iron under the slab and galvanized steel in the walls. When a plumber or inspector says DWV, they mean everything except the pressurized water supply lines.

Expansion tank

A small tank, usually mounted near the water heater, with an air bladder that absorbs the extra volume water takes on as it heats. If your home has a pressure reducing valve or a check valve at the meter, heated water has nowhere to go, so pressure spikes and the relief valve drips. That kind of closed system is common here. Tap the tank: if it sounds full of water all the way up, or water comes out of the air valve, it has failed.

FGUA

The Florida Governmental Utility Authority, a public utility that owns and operates water and sewer systems in several Florida counties, including parts of Lehigh Acres and North Fort Myers in Lee County. As with most utilities, the meter and everything on the street side of it belong to the utility, and the pipe between the meter and your house is yours. Knowing that split saves a lot of phone calls when a water line leaks in the yard.

Fill valve

The upright valve inside a toilet tank that refills it after a flush. If the toilet runs for a few seconds on its own when nobody has used it, the fill valve is usually topping off a tank that’s slowly losing water through the flapper. A fill valve that hisses and never fully shuts off often has a worn seal or grit inside it, which happens a lot after a utility works on the main in your street.

Flapper

The rubber seal at the bottom of a toilet tank that lifts when you flush. When it warps or swells, water trickles into the bowl all day and you pay for it. Chloramine and in-tank bleach tablets both shorten flapper life. A simple test: add a few drops of food coloring to the tank, wait 15 minutes without flushing, and check the bowl. Color in the bowl means the flapper is leaking.

Galvanized pipe

Steel pipe coated in zinc, once used for water supply. It rusts from the inside until the opening narrows, which shows up as low pressure, brown water after the house sits empty, and leaks at threaded joints. It’s less common here than in older northern cities, but it does turn up in homes from the 1950s through the 1970s, particularly in the older neighborhoods of Fort Myers. Most insurers and inspectors will flag it.

Grinder pump

A pump with cutting blades that grinds household sewage into slurry and pushes it through a small pressure pipe to the sewer main. Some neighborhoods and waterfront lots where gravity sewer isn’t practical rely on them. They need electricity, so after a storm knocks out power you have very limited flushing until it comes back. Wipes, grease and dental floss are what usually jam them.

Hard water

Water carrying high levels of dissolved calcium and magnesium. Much of Southwest Florida’s water comes from limestone aquifers, so private wells and some public systems deliver hard water. Signs include white crust on fixtures, spotted glass shower doors and sediment in tank heaters. Tankless heaters need regular descaling here. Hardness varies a lot by utility and source, which is why we wrote a separate page on Cape Coral water quality and other cities.

Hose bib

The outdoor faucet, also called a spigot or sillcock. Ours don’t need freeze protection, but they take a beating from sun, sprinkler overspray and salt air near the coast. A bib that drips at the handle usually needs a new packing washer. One that leaks inside the wall or behind the stucco is more serious, because the water goes where you can’t see it. Every hose bib should have a vacuum breaker on the spout.

Hydrogen sulfide

The gas behind the rotten egg smell common in Southwest Florida well water. If the smell is in both hot and cold water, it’s coming from the well. If only the hot side smells, the water heater anode is likely reacting with sulfur bacteria. Treatment ranges from aeration to oxidizing filters to chlorination, depending on how strong the smell is. A water test comes before any equipment.

Hydro jetting

Cleaning a drain or sewer line with a high-pressure water stream through a nozzle that scours the pipe walls instead of just punching a hole through the clog. It’s the usual choice for grease buildup in restaurant lines and heavy scale in older drains. It isn’t right for every pipe. Badly deteriorated cast iron should get a camera inspection first so the jetting doesn’t finish it off. Details on our hydro jetting page.

I to O

Interceptor (grease trap)

A tank or box that slows kitchen wastewater so grease floats and food solids settle before reaching the sewer. Commercial kitchens generally need one, and local utilities set the pumping and inspection rules. An overdue interceptor is one of the most common causes of restaurant backups, and it usually picks a Friday night. Indoor under-sink traps need cleaning far more often than large in-ground units.

Lateral

The private sewer pipe that runs from your house to the public main or the utility’s connection at the property line. In most of our service area, the homeowner owns and maintains it. Roots, low spots called bellies, and offset joints in the lateral cause backups that come back no matter how often you snake the line. A sewer camera inspection tells you which one you’re dealing with, and how far out it is.

Lift station

A pumping station that collects sewage at a low point and pumps it toward the treatment plant. Southwest Florida is flat and low, so utilities rely on a lot of them. The fenced boxes with control panels you see along neighborhood streets are often lift stations. During long power outages after a hurricane, utilities may ask customers to cut water use because stations are running on generators or not running at all.

Main shutoff valve

The valve that turns off water to the whole house. In local homes it’s usually on the incoming line where it enters the building, often in the garage near the water heater or on an exterior wall. There’s also a valve at the meter, which belongs to the utility. Everyone in the house should know where the main is and test it once or twice a year. Our main water shutoff guide shows where to look.

Manifold

A distribution block, usually in the garage or a utility closet, that feeds individual PEX lines to each fixture, often with a labeled shutoff for each one. You’ll see these in many PEX repipes and newer homes. The advantage is that you can shut off one bathroom without killing water to the whole house. The tradeoff is more pipe overall and a lot of connections in one spot.

Meter leak indicator

The small triangle, star or dial on your water meter that spins with even a tiny flow. Turn off every fixture and the irrigation, then watch it for a few minutes. If it moves, water is going somewhere: a running toilet, a stuck irrigation zone, or a hidden leak in the wall or under the slab. It’s the first test we suggest before anyone pays for leak detection.

Mixing valve

A valve that blends hot and cold water to a set temperature. A thermostatic mixing valve at the heater lets you store water hotter, which helps control bacteria, while sending safer water to the taps. A pressure-balancing valve in a shower keeps the temperature steady when someone flushes. If your shower swings between hot and cold, the cartridge is usually worn or clogged with scale.

P to R

PB2110 / polybutylene

Polybutylene is the gray, sometimes blue or black, flexible plastic supply pipe installed widely between roughly 1978 and the mid-1990s. Pipe stamped PB2110 is polybutylene. Oxidants in treated water break it down from the inside, and it tends to fail without warning, often at fittings. Many Florida insurers flag it on a 4-point inspection and won’t write or renew a policy until it’s replaced. See our polybutylene and 4-point guide.

PEX-A / PEX-B

PEX is cross-linked polyethylene, the flexible supply pipe used in most repipes today. PEX-A is made in a way that leaves it more flexible, and it’s often joined with expansion fittings: the pipe end is stretched, slipped over the fitting and shrinks back tight. PEX-B is stiffer and usually joined with crimp or clamp rings over insert fittings. Both are approved materials under the Florida Building Code. Our PEX vs copper guide compares options.

PRV

Pressure reducing valve, the bell-shaped valve on the main line that drops street pressure to a safe level for the house, often set somewhere around 50 to 60 psi. The plumbing code calls for one when static pressure would exceed 80 psi. A failing PRV causes banging pipes, running toilets and dripping relief valves. A gauge on a hose bib tells you a lot in a minute. See water pressure problems.

P-trap

The U-shaped bend under a sink, built into toilets and under floor drains, that holds water to block sewer gas. A sewer smell from a guest bath or a shower nobody uses is usually a dry trap: the water evaporated while the house sat closed up over summer. Pour a quart of water down each one when you get back. Our seasonal home checklist has the rest of the list for part-time residents.

Pressure tank

On a well system, the tank that stores water under air pressure so the pump doesn’t start every time you open a tap. The bladder inside holds an air charge, normally set a couple of psi below the pump’s cut-in pressure. When the bladder fails, the pump clicks on and off rapidly, which wears out pumps and pressure switches. See well pumps and pressure tanks.

Pinhole leak

A tiny leak, usually in copper pipe, where corrosion has worked through the wall from the inside. Water chemistry and high flow velocity are common contributors. One pinhole often means others are on the way, because the whole system has been exposed to the same water. If you’ve had two or three repairs on the same copper system, it’s time to compare repiping against more patching.

Recirculation pump

A pump that moves hot water through the lines so it reaches the faucet faster. Some systems use a dedicated return line back to the heater. Others use a crossover valve under the farthest sink that sends water back through the cold line. In large single-story homes with the water heater out in the garage, the wait for hot water at the primary bath can be long, and this is the usual fix.

RO (reverse osmosis)

A treatment method that pushes water through a very fine membrane to remove dissolved salts, minerals and many contaminants. Under-sink RO units for drinking water are common here. Cape Coral treats much of its public supply with reverse osmosis because its groundwater source is brackish. Home RO systems need regular filter and membrane changes, and they send some water to the drain as they work. See water softeners and filtration.

Reclaimed water

Highly treated wastewater delivered through a separate pipe system for irrigation. Cape Coral runs one of the larger reclaimed irrigation systems in the country, and other utilities supply it to golf courses and communities. Reclaimed pipes, valve boxes and sprinkler heads are marked purple. It isn’t for drinking, filling pools or rinsing off, and any cross-connection between reclaimed and drinking water piping is a serious code violation.

Repipe

Replacing all the water supply lines in a home, usually with PEX, instead of fixing leaks one at a time. Common triggers here are polybutylene, brittle CPVC, repeated copper pinholes, and slab leaks in copper buried under the floor. Most local repipes reroute lines through the attic and walls rather than under the slab, so future leaks are reachable. Drywall patching is part of every repipe and worth asking about up front.

S to Z

Saddle valve

A clamp-on valve that pierces a copper or plastic line, often used years ago for ice makers and under-sink filters. They’re known for slow leaks and for failing when someone finally turns them. We replace them with a proper tee and shutoff. If you spot one under your sink or behind the refrigerator, it’s a cheap fix before it becomes a flooring claim.

Septic tank

A buried tank that holds household wastewater long enough for solids to settle and break down before the liquid moves on to the drainfield. Florida moved oversight of septic systems from the Department of Health to the Department of Environmental Protection in 2021. Many homes in Lehigh Acres and parts of Cape Coral are on septic, or were until city sewer reached them. See septic to sewer conversion.

Sewage ejector

A pump in a sealed basin that lifts wastewater from fixtures that sit lower than the sewer line, such as a below-grade pool bath or some commercial setups, up into the gravity drain. A float switch starts the pump. A high-water alarm is a must, and if you hear it, stop running water to that area until the pump is checked. Ejector basins also need a vent and a working check valve.

SIRS

Structural Integrity Reserve Study, required by Florida condo law passed in 2022 after the Surfside collapse, for buildings three stories or taller. Plumbing is one of the components the study must cover, and associations have to fund reserves for it. For owners, that puts aging cast iron stacks and supply risers on the board’s long-term plan instead of the emergency list. Our condo plumbing guide covers who handles what.

Slab leak

A leak in a water line under the concrete slab most Southwest Florida homes sit on. Signs include a warm spot on tile, the sound of running water with everything off, a meter that keeps moving, and a sudden jump in the bill. Copper buried in the slab is the usual source. We pin down the location before cutting anything, then decide between a spot repair and rerouting the line. See slab leak repair.

Softener

A tank of resin beads that trades hardness minerals for sodium or potassium, recharged with salt from a brine tank. It stops scale but doesn’t remove chlorine, sulfur smell or most contaminants, which is why many homes here pair it with a carbon filter or RO. Keep the brine tank stocked and watch for a salt bridge, a hard crust that leaves water underneath it unable to make brine.

Supply line

The flexible hose connecting an angle stop to a faucet, toilet or appliance. Braided stainless lines are standard now. Toilet supplies with plastic nuts and rubber washing machine hoses are a frequent cause of water damage claims. Replace them every several years, and always after buying a home if you can’t tell how old they are.

Sweating

Condensation on cold pipes and toilet tanks in humid weather. In a Southwest Florida summer, a sweating toilet tank can drip enough to stain flooring, and cold lines running through a hot attic can drip onto drywall. It isn’t a leak, but the damage looks the same. Pipe insulation helps in the attic. If the moisture never dries even with the AC running, test for a real leak.

T&P valve

The temperature and pressure relief valve on every tank water heater, typically rated to open at 150 psi or 210 degrees Fahrenheit. Its discharge pipe has to run to a safe spot where hot water won’t hurt anyone. A dripping T&P is a warning, often pointing to a failed expansion tank, high pressure from a bad PRV, or a heater running too hot. Never cap or plug it.

Tankless descaling

Flushing a tankless water heater’s heat exchanger with a mild acid solution circulated through its service valves. In hard water, scale builds quickly and the unit starts throwing error codes, losing flow or making noise. Manufacturers set flushing intervals based on water hardness, and skipping them can affect warranty coverage on the unit itself. See tankless water heaters.

UEP

Utilities Extension Project, Cape Coral’s long-running program to bring city water, sewer and reclaimed irrigation to neighborhoods built on wells and septic. When the UEP reaches your street, the city builds the mains, and the owner handles connecting the house, abandoning the septic tank and deciding what to do with the well. Our UEP hookup guide walks through the order of work.

Vacuum breaker

A simple backflow device that lets air into a line so water can’t be siphoned backward. Hose bib vacuum breakers screw onto outdoor faucets; atmospheric vacuum breakers show up on some irrigation systems. If you leave a hose in the pool or a fertilizer sprayer on the end, the vacuum breaker is what keeps that water out of your kitchen tap.

Vent stack

The vertical pipe that runs from the drain system up through the roof, letting air into the drains so they flow and traps don’t get siphoned dry. Gurgling sinks and slow toilets with no clog can mean a blocked vent. Leaves, nests and storm debris cause blockages here, and roof replacements after hurricanes sometimes damage the flashing or boot around vent pipes.

Water hammer

The bang you hear when a valve closes fast and moving water slams to a stop. Washing machines, dishwashers, ice makers and irrigation valves are common sources. Fixes include water hammer arrestors near the valve, strapping loose pipes and lowering high house pressure. Left alone, repeated hammering loosens fittings and stresses connections inside the walls.

Wax ring

The seal between the bottom of the toilet and the floor flange. A failed wax ring leaks a little with every flush, which rots subfloor or darkens the grout around the base, and it can let sewer gas into the room. A toilet that rocks will break the seal. Wax-free foam seals are an option on some installs. If the base is wet after flushes, replace the ring before the floor goes soft.

Wye

A Y-shaped drain fitting that joins two lines at an angle so waste flows smoothly in one direction. Cleanouts are often built off a wye. Plumbers use wye, sanitary tee and long-sweep elbow as specific instructions, because using the wrong fitting in a drain causes clogs that keep coming back.

Pipe materials by build era

Most of the terms above make more sense once you know what your house is likely to have. This is a rough guide for Southwest Florida homes. Additions, partial repipes and past repairs mix materials, so a camera or a look in the attic is the only way to be sure.

Era built	Usual water supply	Usual drains	What to watch
1950s to 1970s	Copper or galvanized steel	Cast iron under the slab	Narrowed galvanized lines, cast iron scaling and cracking
Late 1970s to mid-1990s	Polybutylene or copper	PVC, some cast iron in earlier homes	Polybutylene on 4-point inspections, copper pinholes
Mid-1990s to 2000s	CPVC or copper	PVC	Brittle CPVC near heaters and in attics
2000s to today	PEX, some CPVC	PVC	Fitting type, manifold condition, expansion tanks

Terms that show up on inspection and insurance reports

Buyers and sellers see a short list of plumbing phrases over and over. Here’s what they usually mean in practice.

• 4-point inspection: an insurance inspection covering roof, electrical, HVAC and plumbing on older homes. On the plumbing side, the inspector notes pipe material, water heater age and visible leaks.
• PB or polybutylene present: often a dealbreaker for insurance until the pipe is replaced. Expect the carrier to ask for proof of a repipe.
• Evidence of prior leak: staining under a sink or on a ceiling. The inspector can’t tell if it’s active, so get the source checked.
• No expansion tank: common on older water heater installs. Worth fixing if the home has a PRV or a meter check valve.
• Water heater at or past expected life: the inspector read the date code. Tank units in hard water often don’t make it as long as the label suggests.
• Slow drain or gurgling: could be a simple clog, a vent issue, or a failing cast iron or clay line. A camera answers it.

Who owns what: utility terms

When something leaks or backs up outside, the first question is whether it’s yours or the utility’s. The split below is typical for public systems in our area, but each utility publishes its own rules, so check yours.

Term	What it is	Usually owned by
Water main	The large pipe in the street	Utility
Meter and meter box	Measures your use, often with a shutoff on the street side	Utility
Service line	Pipe from the meter to the house	Property owner
Sewer lateral	Drain pipe from the house to the main or property-line connection	Property owner
Property-line cleanout	Access point near where the lateral meets the main	Varies by utility
Lift station	Pumps sewage toward the plant	Utility
Grinder pump on a lot	Pump serving one home on a pressure sewer	Varies by utility or community

Words that mean call right away

Most glossary terms describe slow problems you can schedule. These don’t wait.

• Sewage coming up in a tub or shower, which usually means the main line or lateral is blocked.
• An ejector or grinder pump alarm sounding.
• The meter leak indicator spinning with every fixture off and water appearing on the floor.
• A T&P valve discharging hot water steadily.
• A gas smell near CSST, a range or a water heater. Leave the house first and call your gas supplier or 911 from outside.
• A burst supply line. Shut the main, then call.

Our office is open Monday to Friday, 8am to 5pm. Outside those hours, call (239) 518-4198 for urgent problems and we’ll help when we can.

Keeping these terms off your repair invoice

Plenty of the entries above, like failed flappers, seized angle stops, dead anode rods and waterlogged expansion tanks, are cheap to catch early and expensive to find late. Our annual plumbing maintenance plan is a yearly check-up of the whole system, so worn parts get noticed before they leak. Call us for details on what it includes.

If you’ve got a term on an inspection report, utility notice or quote that isn’t listed here, call (239) 518-4198 or email help@homeflowfl.com. We serve homes and businesses across Lee, Charlotte and Collier Counties from our office at 3903 Dr Martin Luther King Jr Blvd, Suite A, in Fort Myers.