Plumbing glossary · plain English

Plumbing Terms, Decoded.

Name: Streamlined Plumbing
Address: 59 Morphy Ave, Fairhope, AL, 36532, US
Telephone: +1-251-423-7654

45 plumbing terms explained the way we'd explain them at your kitchen table — what the term means, why it matters, and (where helpful) the next page to read for deeper context. Reading a quote instead? Start with the cost guides.

A

Aerator: The little screened tip that screws onto a faucet spout to mix air into the stream and control flow. Mineral grit from hard water clogs it over time, and a clogged aerator is the single most common cause of weak pressure at one faucet — unscrew it, rinse it, and the pressure often comes right back.
Anode Rod: A sacrificial metal rod inside a tank water heater that corrodes on purpose so the tank doesn't. Once it's used up, the tank itself starts to rust — which is why a spent anode rod shortens a heater's life, and replacing it can extend one. Our mineral-heavy water wears them faster.
Angle Stop (Fixture Shutoff): The small shutoff valve under a sink or behind a toilet that lets you cut water to that one fixture without shutting off the whole house. Worth knowing where yours are — a stuck or half-closed angle stop is a common, easily-missed cause of a slow-filling toilet or weak fixture.

B

Backflow Preventer: A device that stops used or contaminated water from reversing direction and flowing back into your clean drinking water — for example from an irrigation system. Many water providers require the assembly to be tested regularly to protect the public supply.
Backwater Valve: A one-way valve on a sewer line that lets waste flow out but blocks it from backing up into the house — useful protection where the municipal main can surcharge during heavy rain. Not every home has one; homes prone to main-line backups sometimes benefit from adding one.
Ball Valve: A shutoff valve with a lever handle that turns a quarter-turn from full-open to full-closed — reliable and easy to see at a glance whether it's on or off. The modern replacement for old gate valves, which seize and fail with age.

C

Camera Inspection (Sewer Camera): A waterproof camera on a flexible cable pushed down a drain or sewer line so a plumber can see exactly what's happening inside — grease, roots, a bellied section, or a break — and locate it. It turns a guess into a targeted repair. At Streamlined Plumbing you see the same screen we do.
Cartridge (Faucet): The internal part in a single-handle faucet that controls water flow and temperature. When a faucet drips even though it's turned all the way off, a worn cartridge is usually why — replacing it is an inexpensive, quick fix.
Cleanout: A capped access point on your drain or sewer line that lets a plumber clear a blockage or run a camera without going through a fixture. Knowing where your main cleanout is — often outside near the house — saves time on a backup. If sewage is visible at the cleanout, the main line is blocked.
Copper Pipe: A long-standing water-supply pipe material — durable but expensive, and vulnerable to pinhole leaks from corrosion as it ages. Still common in older homes; most modern repipes use PEX instead for its corrosion resistance and lower cost.

F

Fill Valve: The valve inside a toilet tank that refills it after a flush and shuts off when the water reaches the set level. A fill valve that won't shut off is one of the top causes of a toilet that runs constantly — a cheap, quick part to replace.
Flapper: The rubber seal at the bottom of a toilet tank that lifts to flush and drops to hold water. When it warps or wears, water leaks from the tank into the bowl — triggering the 'phantom flush' and quietly wasting hundreds of gallons a day. The most common running-toilet fix.
Float Switch: The float that rises with water level to switch a sump pump or grinder pump on and off. A stuck or tangled float is a frequent cause of both a pump that won't run and a pump that runs nonstop — check it first when a pump misbehaves.

G

Galvanized Pipe: Steel supply pipe coated in zinc, common in homes built before the 1960s. It corrodes and scales from the inside over decades, slowly choking water pressure and eventually leaking. Declining whole-house pressure in an old home often means the galvanized pipe is aging out — a repipe candidate.
Garbage Disposal: The motorized unit under a kitchen sink that grinds food scraps so they wash down the drain. A hum with no spin usually means it's jammed, not dead; leaks come from the flange, the dishwasher connection, or a corroded housing.
GPM (Gallons Per Minute): The measure of water flow rate — how a tankless water heater's capacity is rated, and how fixtures are compared. Sizing a tankless unit means matching its GPM to your peak simultaneous demand (two showers plus a dishwasher, say) so it never runs cold.
Grinder Pump: A pump that grinds household wastewater into a slurry and pushes it up and out to the sewer under pressure — essential for homes that sit below the sewer main, which is common in low-lying and waterfront areas of coastal Baldwin County. Grinder pump systems are one of Streamlined Plumbing's specialties.

H

Hard Water: Water with a high dissolved-mineral content (mostly calcium and magnesium). It leaves scale that clogs aerators and showerheads, shortens water-heater life, and builds up in pipes and tankless heat exchangers — which is why descaling and periodic maintenance matter in our area.
Hose Bib: The outdoor faucet you connect a garden hose to (also called a spigot or sillcock). Exterior hose bibs are a common freeze-and-leak point in a cold snap; a frost-free model and a shutoff inside help protect them.
Hydro Jetting: Clearing a drain or sewer line with a high-pressure water stream that scours the full inside diameter of the pipe — cutting through grease, scale, and roots that a cable snake only pokes a hole through. It costs more per visit but leaves the pipe wall clean, so the clog stays gone longer.

L

Leak Detection: Locating a hidden leak — inside a wall, under a floor, or beneath a slab — with non-invasive tools like acoustic listening equipment and moisture meters, so the leak is pinpointed before anything is opened up. That means a small, targeted repair instead of guessing and cutting.

M

Main Shutoff Valve: The valve that cuts water to the entire house — usually at the meter near the street or where the main line enters the home. Find and tag yours now: in a burst-pipe emergency, shutting it off in seconds is the difference between a mop-up and a flood.
Main Sewer Line: The single pipe that carries all of your home's wastewater out to the municipal sewer or septic. When it clogs, multiple fixtures back up at once and sewage rises in the lowest drain — a stop-using-water situation. Roots and grease are the usual culprits.

P

PEX / PEX-a (REHAU): A flexible plastic water-supply piping that resists the scale and corrosion that kill metal pipe. PEX-a is the highest-performing type — it flexes with fewer fittings (fewer joints means fewer potential leak points) and installs faster and cleaner than copper. Streamlined Plumbing uses REHAU PEX-a for whole-home repipes.
Pilot Light / Thermocouple: On a gas tank water heater, the small standing flame (pilot) and the safety sensor (thermocouple) that keeps gas flowing only while the flame is lit. A pilot that won't stay lit is often a failed thermocouple — a common 'no hot water' cause on gas units. Don't keep relighting it repeatedly; have it diagnosed.
Polybutylene: A gray plastic supply pipe used from the late 1970s into the mid-1990s, now known to become brittle and fail — often without warning. If your home still has polybutylene, recurring leaks are a sign the whole system is aging out, and a repipe is usually the smart long-term move.
Pressure-Reducing Valve (PRV): A valve that lowers incoming municipal water pressure to a safe level for your home's plumbing. A failing PRV can cause pressure to drop across the whole house — or swing too high and stress fixtures and joints. Whole-house pressure problems are worth having the PRV checked.
P-Trap: The U-shaped bend under every drain that holds a little water to block sewer gas from rising into the room. In a rarely-used sink or floor drain, that water evaporates and the barrier disappears — the number-one cause of a mystery sewage smell. Run water down the drain to refill it.

R

Repipe: Replacing a home's water-supply piping — the fix when you're chasing leak after leak, pressure has dropped across the house, or the home still has old polybutylene or corroded galvanized pipe. Streamlined Plumbing repipes in REHAU PEX-a, a corrosion-resistant, long-life system.
Rooter: A cable machine (and the service name) used to clear a clogged drain or sewer line — the rotating cable cuts through or breaks up a blockage, including tree roots. Effective for clearing, but on a grease- or scale-coated pipe the clog often returns; jetting scours the pipe clean.

S

Sediment (Water Heater): Mineral debris that settles to the bottom of a tank water heater, especially in hard-water areas. It steals tank capacity (hot water runs out faster), causes popping or rumbling noises, and accelerates corrosion. Periodic flushing clears it and extends the heater's life.
Sewer Line: The drain pipe carrying wastewater from your home to the sewer or septic. Failures show up as multiple slow or backing-up drains, gurgling, sewage smell, or soggy patches in the yard. Camera inspection finds the cause; jetting or a targeted repair fixes it.
Shutoff Valve: Any valve that stops water flow — at a fixture (angle stop), for the whole house (main shutoff), or for an appliance like a water heater. Knowing where they are and that they turn freely is the cheapest insurance against water damage.
Slab Leak: A water line leaking underneath a home's concrete foundation. Tells include a warm spot on the floor, the sound of running water with everything off, and an unexplained bill spike. We locate them precisely and can often reroute the line to avoid breaking up the slab.
Snake / Auger: A flexible cable fed into a drain to clear a clog. A hand auger handles small fixture clogs; a powered drum machine reaches deeper. It punches through a blockage well, but on a coated pipe it leaves the buildup behind — which is why some drains re-clog and eventually need jetting.
Sump Pump: A pump in a pit at the low point of a home that switches on to remove rising groundwater — the frontline defense against flooding during heavy Gulf Coast rain. Test it with a bucket of water before storm season, and consider a battery backup, since the worst storms bring the outages that disable a standard pump.
Supply Line: The flexible or rigid line that carries water from a shutoff valve to a fixture or appliance. The braided supply lines behind toilets, faucets, and washing machines are a common failure point — an inexpensive part that, when it bursts, causes a lot of water damage.

T

Tankless Water Heater: A water heater that heats water on demand as it flows through, instead of storing it in a tank — so it never runs out, takes up less space, and typically lasts longer. It needs periodic descaling in hard water. Sizing to your peak GPM demand is what keeps it from running cold.
Temperature & Pressure (T&P) Relief Valve: A safety valve on a water heater that releases water if temperature or pressure inside the tank climbs too high. A dripping T&P valve is either doing its job (excess pressure — which needs diagnosing) or has failed. It should never be capped off or ignored.
Trap: The curved section of drain pipe (like a P-trap) that holds standing water to block sewer gas. Every fixture has one. A dry trap lets odor in; a clogged trap is a common, easy-to-clear cause of a slow single drain.
Trenchless Repair: Repairing or replacing a sewer line with little or no digging — for example by lining the existing pipe or bursting and replacing it along the same path. It can rehabilitate some lines with minimal disruption to the yard, though not every pipe is a candidate.

V

Vent Stack (Plumbing Vent): The pipe (usually running up through the roof) that lets air into the drain system so water flows smoothly and sewer gas escapes safely outside. A blocked or broken vent causes gurgling drains and can let sewer smell into the house.

W

Water Hammer: The banging or knocking in pipes when a valve or appliance shuts off water suddenly and the moving water slams to a stop. Beyond the noise, it stresses joints and fixtures over time. Fixes range from securing loose pipe to installing water-hammer arrestors.
Water Heater (Tank): A storage water heater that keeps 40–50 gallons hot and ready. Lower up-front cost and simple to service, it generally lasts about 8–12 years. Watch for rusty water, popping noises, and moisture at the base — a leak at the base usually means the tank has corroded through and needs replacing.
Wax Ring: The seal between a toilet's base and the drain flange in the floor. When it fails, water — and sewer gas — escapes at the base of the toilet, and it can rot the subfloor if ignored. Reseating the toilet with a fresh wax ring is the fix.