Plumbing terms, in plain English.

An aerator is the small mesh screen screwed onto the tip of a faucet spout that mixes air into the water stream to reduce splash and save water. When a faucet turns weak or sputtery, a mineral-clogged aerator is the most common cause — unscrew it and rinse the screen before assuming a bigger problem.

Houston note: Houston's moderately hard water scales up aerators fast. Rinsing them twice a year keeps faucets flowing full strength.

• What Houston's hard water does to your plumbing

An angle stop is the small shut-off valve on the wall under a sink or toilet that lets you cut water to one fixture without shutting down the whole house. Turn each one off and on twice a year — a seized angle stop turns a simple faucet swap into an emergency shut-off situation.

• Plumbing emergency? Do these 5 things first

An anode rod is a sacrificial metal rod inside a tank water heater that corrodes on purpose so the steel tank doesn't. Once the rod is fully eaten away, corrosion starts working on the tank itself — which is why replacing it every 3–5 years is the cheapest way to extend a water heater's life.

Houston note: Hard Houston water consumes anode rods faster than the national average. We check them during every VIP plan inspection.

• VIP Home Protection Plan
• Water heater replacement cost in Houston

Backflow is water flowing backward through your pipes, which can pull contaminated water from an irrigation system, hose, or fixture into your clean drinking supply. It happens when supply pressure drops suddenly — a water main break or a big irrigation draw. A backflow prevention device is a one-way assembly installed to make it physically impossible.

Houston note: Most Greater Houston municipalities require backflow preventers on sprinkler systems and annual testing by a licensed tester.

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A ball valve is a shut-off valve that closes with a quarter turn of a lever handle, using a drilled ball inside the body to open or block flow. It's the modern replacement for old gate valves because it seals reliably for decades and you can see at a glance whether it's open (handle in line with the pipe) or closed (handle across it).

Bio-One is a professional-grade biological drain treatment whose live bacteria digest the grease and organic build-up that cause slow drains. Unlike caustic chemical cleaners, it's safe for pipes, septic systems, and families — it's the maintenance treatment our own technicians use and sell.

• Order Bio-One from our products page
• Why your drains keep clogging

A camera inspection (sewer camera) feeds a waterproof video camera through a drain or sewer line to show exactly what the problem is — roots, grease, a belly, or a break — and precisely where it sits. It's the difference between guessing at a repair and knowing, and it should come before any major sewer quote.

• Sewer line repair: trenchless vs. digging

Cast iron pipe is the heavy black drain pipe installed in most homes built before the mid-1970s. It rusts from the inside out, so a line can look fine outside while the bottom half has scaled shut or rotted away — recurring backups and sewage smells are the usual first symptoms.

Houston note: Older Houston neighborhoods — Meyerland, Oak Forest, the Heights — are hitting the end of cast iron's 50–75 year lifespan, which is why sewer replacements cluster there.

• Sewer line repair options in Houston

A check valve is a one-way valve that lets water flow in a single direction and slams shut if it tries to reverse. You'll find them protecting water heaters, sump and sewage pumps, and irrigation tie-ins — anywhere backward flow would cause damage or contamination.

A cleanout is a capped fitting — usually a round plug at ground level near an exterior wall — that gives a plumber direct access to your sewer line without pulling a toilet. If sewage is rising out of the cleanout, the blockage is in your main sewer line, not a single fixture drain.

• Why your drains keep clogging

A drain auger, or snake, is a flexible steel cable spun through a drain to punch through a blockage. A snake opens a hole in the clog; it doesn't clean the pipe wall — which is why snaked drains often clog again and why recurring backups call for hydro-jetting or a camera look instead.

• What actually fixes recurring clogs

An escutcheon is the decorative plate that covers the hole where a pipe or valve stem passes through a wall or floor — the trim ring behind your shower handle or under the sink stops. Cosmetic, but a loose shower escutcheon can let splash water into the wall, so it's worth re-caulking.

An expansion tank is a small air-cushioned tank piped near the water heater that absorbs the pressure created when heated water expands. On a closed system (one with a check valve or PRV), code requires one — without it, thermal expansion hammers your T&P relief valve, fixtures, and the water heater itself.

A fixture is any device that delivers or drains water in a home — sinks, faucets, toilets, tubs, showers, and hose bibbs all count. Plumbers size drains, vents, and water heaters by counting a home's fixtures, which is why estimates start with that walkthrough.

A flapper is the rubber seal at the bottom of a toilet tank that lifts to release water into the bowl when you flush. A worn flapper is the number-one cause of a running toilet and can silently waste 200+ gallons a day — if food coloring dripped in the tank shows up in the bowl without flushing, the flapper is leaking.

Galvanized pipe is zinc-coated steel supply piping that was standard into the 1960s. It corrodes shut from the inside, causing low pressure and rusty or metallic-tasting water — homes still running on galvanized supply lines are the strongest candidates for a whole-home repipe.

• Whole-home repiping: cost & what to expect

A garbage disposal is the motorized grinder under a kitchen sink that shreds food scraps so they can pass down the drain. Most jams come from grease, fibrous vegetables, and starchy loads — and most “dead” disposals just need the red reset button on the bottom of the unit.

• Why your drains keep clogging

A gas line pressure test pressurizes a home's gas piping with air and watches a gauge to confirm the system holds — the standard way to prove there are no leaks. Utilities require a passing test before restoring service after a leak, a remodel, or a meter being locked off.

Houston note: After a suspected leak, CenterPoint locks the meter until a licensed plumber's pressure test passes city inspection — we handle the test, the repair, and the paperwork.

• Gas line services

GPM, gallons per minute, measures water flow — it's how tankless water heaters are sized and how fixtures are rated. A typical shower runs about 2 gpm, so a household that showers while running the dishwasher needs a tankless unit in the 7–9 gpm class to keep everything hot.

• Tankless vs. tank for Houston homes
• Get a water heater quote

Greywater is gently used wastewater from sinks, showers, tubs, and laundry — everything except toilet waste, which is blackwater. The distinction matters for reuse rules and for diagnosing smells: a greywater odor points to a trap or vent issue, while a blackwater smell means a sewer-side problem.

Hard water is water carrying a high load of dissolved calcium and magnesium. It isn't a health risk, but it is a plumbing tax: scale shortens water heater life, clogs aerators and cartridges, spots glassware, and stiffens laundry.

Houston note: Greater Houston water runs moderately hard to hard depending on your utility district — one reason local water heaters age faster than the brochure says.

• What Houston's hard water does to your plumbing

A hose bibb is the outdoor faucet you screw a garden hose onto. Frost-resistant models close the valve deep inside the warm wall; standard ones close right at the spout, which is why they split in a freeze if left uncovered.

Houston note: During Houston's rare hard freezes, uncovered hose bibbs are the first casualty — foam covers cost a few dollars and save a wall-opening repair.

• See a real hose bibb job

Hydro-jetting cleans a drain or sewer line with a high-pressure water nozzle — up to about 4,000 psi — that scours grease, sludge, scale, and roots off the full circumference of the pipe wall. Where a snake pokes a hole through a clog, jetting restores the pipe's original diameter, which is why it's the fix for lines that keep re-clogging.

• What actually fixes recurring clogs

A hydrostatic test plugs a home's drain system and fills it with water to a set level — if the level drops, the sewer system is leaking somewhere under the slab. It's the standard way to confirm or rule out under-slab drain leaks.

Houston note: Hydrostatic tests are routine in Houston real-estate deals and after foundation repair, because our shifting clay soil is hard on under-slab lines.

• Signs of a slab leak in a Houston home

Leak detection is the process of pinpointing a hidden leak — with acoustic listening gear, pressure isolation, thermal imaging, or tracer gas — before anyone cuts concrete or drywall. Good detection turns “somewhere under the house” into a two-foot square, which is most of the cost battle.

• Signs of a slab leak in a Houston home

The main shut-off valve stops all water to your house. It's usually at the meter box near the curb or where the supply line enters the home — and finding it before an emergency is the single most useful piece of plumbing knowledge a homeowner can have.

• Plumbing emergency? Do these 5 things first

A P-trap is the U-shaped pipe under every sink and behind every tub that holds a small pool of water, sealing sewer gas out of your home. If a bathroom smells like sewage after sitting unused, the trap has likely evaporated dry — running the tap for thirty seconds restores the seal.

PEX (cross-linked polyethylene) is the flexible plastic supply piping used in most modern repipes. It bends around corners with far fewer joints than rigid pipe, tolerates minor freezes by flexing, and installs fast — which is why a whole-home PEX repipe typically takes days, not weeks.

• Whole-home repiping: cost & what to expect

A pilot light is the small standing flame that ignites the main burner on older gas water heaters and furnaces. If yours won't stay lit, the usual suspect is a failed thermocouple — the safety sensor that cuts gas when it can't feel the flame. Newer units use electronic ignition instead.

A pressure-reducing valve steps municipal water pressure down to a safe household level, typically 50–70 psi. Pressure above about 80 psi hammers fixtures, ruptures supply hoses, and voids many water heater warranties — a $10 gauge on a hose bibb tells you where you stand.

PVC is rigid white plastic pipe used for drains and cold-water lines; CPVC is its cream-colored cousin rated for hot water supply. CPVC grows brittle with age and snaps under stress.

Houston note: Brittle CPVC is a signature failure in Houston homes built from the 1980s through the 2000s — if yours is cracking at fittings, it's repipe conversation time.

• Whole-home repiping: cost & what to expect

Repiping replaces all of a home's water supply piping in one planned project instead of patching failures one leak at a time. It's the right call when pipes fail because of what they're made of — galvanized steel, brittle CPVC, or pinholing copper — rather than one bad joint.

• Whole-home repiping: cost & what to expect
• Talk to a repipe pro

Rough-in is the plumbing installed inside walls and floors before drywall goes up — supply lines, drains, and vents stubbed out to each future fixture. It's also a measurement standard: a “12-inch rough-in” toilet needs its drain centered 12 inches from the finished wall.

Scale is the chalky mineral crust hard water leaves on everything it touches — heating elements, fixture cartridges, showerheads, and the inside of pipes. On a water heater element, scale acts as insulation, forcing longer burns and higher energy bills before the element fails outright.

• What Houston's hard water does to your plumbing

Sediment is the mineral grit that settles at the bottom of a tank water heater as hard water heats. A popping or rumbling tank is steam escaping through the sediment layer — the audible sign it's overdue for a flush.

• Water heater flush (below)

A service fee, or trip charge, is what a plumbing company charges to send a licensed technician to your door to diagnose the problem. It covers the visit and the diagnosis — reputable companies tell you the number before dispatching, and many (including us) apply or waive it when you approve the work.

Houston note: Texas Quality VIP members skip the service fee entirely, and get a guaranteed appointment within 24 hours.

• VIP Home Protection Plan
• How to choose a plumber in Houston

The sewer lateral is the buried pipe that carries all of a home's wastewater from the house to the city main — and the homeowner, not the city, owns and maintains it. Roots, bellies, and joint separations in the lateral are behind most chronic whole-house backups.

Houston note: Houston's expansive clay soil swells and shrinks with the weather, pulling lateral joints apart and inviting roots — the root cause (literally) of many Meyerland and Spring Branch backups.

• Sewer line repair: trenchless vs. digging

A slab leak is a leak in a water line running beneath a home's concrete foundation slab. Classic signs: warm spots on the floor, a water meter that spins with everything off, unexplained bill jumps, and the sound of running water in a quiet house.

Houston note: Houston's shifting clay soil flexes foundations enough to wear through under-slab copper — slab leaks are a local specialty, not a rarity.

• Signs of a slab leak in a Houston home
• Book a leak check

The temperature-and-pressure (T&P) relief valve is the safety valve on every water heater that opens automatically if the tank gets dangerously hot or over-pressurized. If yours drips, never cap it — that drip is the safety system telling you something upstream (pressure, temperature, or thermal expansion) is wrong.

A tankless water heater heats water on demand as it flows through the unit instead of storing 40–50 hot gallons in a tank. You get endless hot water and a 20+ year service life in a suitcase-sized footprint — in exchange for a higher install cost and a required annual descale in hard-water areas.

Houston note: We install Navien condensing tankless units across Greater Houston — and in our hard water, the annual descaling flush isn't optional if you want the 20-year lifespan.

• Tankless vs. tank for Houston homes
• Navien units on our products page
• Get a water heater quote

A thermocouple is the safety sensor that sits in a pilot light's flame and shuts off the gas the moment it stops sensing heat. When a pilot lights but won't stay lit after you release the button, a worn thermocouple is the most common, and cheapest, culprit.

Trenchless sewer repair replaces or relines a broken sewer pipe through small access pits instead of digging a trench across the yard — either by bursting a new pipe through the old one or curing a resin liner in place. It costs more per foot but saves driveways, patios, and mature trees, which often makes it cheaper overall.

• Sewer line repair: trenchless vs. digging

Upfront pricing means you're quoted the full price of the job — from a standard price book — and approve it before any work starts, instead of watching an hourly meter run. It puts the risk of a slow job on the company, not on you, and makes quotes comparable between companies.

• How to choose a plumber in Houston
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A vacuum breaker is a small one-way backflow device — most visibly the brass cap threaded onto a hose bibb — that stops water from siphoning backward into your drinking supply if pressure drops. Cheap, code-required, and easy to replace when it starts spitting.

• See a real vacuum breaker job

A vent stack is the pipe that runs up through your roof to let air into the drain system, so water can flow freely and P-traps keep their seal. Gurgling drains, slow flushes with no clog, and sewer smells often trace back to a blocked vent — birds' nests and leaves are classic culprits.

Water hammer is the bang or thud in pipes when a fast-closing valve — a washing machine solenoid, a single-lever faucet — slams moving water to a stop. Repeated hammer stresses joints and supply hoses; arrestors (small shock-absorbing cushions) or lowering excessive pressure fixes it.

A water heater flush drains the tank and washes out the sediment layer that builds on the bottom. In hard-water territory an annual flush is the highest-value maintenance a tank heater gets — it quiets rumbling, restores recovery speed, and adds years of life.

Houston note: An annual flush is included in the Texas Quality VIP Home Protection Plan, along with a whole-home plumbing inspection.

• VIP Home Protection Plan
• Water heater replacement cost in Houston

The water main is the utility's supply pipe running under the street; your private service line branches off it at the meter. Everything from the meter to the house is the homeowner's responsibility — including leaks in the yard, which show up as soggy green stripes or a meter that never stops.

• See a real water line repair

A water softener removes the calcium and magnesium that make water hard, swapping them for sodium through ion exchange. Downstream, everything lasts longer — water heaters, fixture cartridges, appliances — and soap actually lathers.

Houston note: In Greater Houston's hard-water districts, a softener is the single best defense for a tankless unit's heat exchanger.

• What Houston's hard water does to your plumbing
• Water filtration services

A yard drain is a surface drainage system — catch basins and buried pipe — that routes rain runoff away from your foundation and low spots in the lawn. It's separate from the sanitary sewer: yard drains handle storm water only.

Houston note: In Houston gully-washers, standing water against the slab feeds the wet/dry soil cycle that moves foundations. Good yard drainage is foundation protection.

• Yard drain services