Cleanout
A capped access point on a drain or sewer line that lets a plumber insert a snake or camera directly into the pipe to clear clogs or inspect it.
A cleanout is a fitting with a removable cap that opens directly into a drain or sewer line, giving a plumber a clean shot into the pipe. Instead of pulling a toilet or working through a small fixture drain, the technician unscrews the cap and runs a snake, auger cable, or camera straight down the line. Cleanouts appear at the base of stacks, where the main line leaves the house, and often in the yard along the sewer run to the street.
The presence and location of a cleanout shapes how much a drain job costs. A clog cleared through an accessible exterior cleanout is fast and inexpensive; the same clog with no cleanout may mean pulling a toilet or cutting into a pipe just to get access, which adds time and labor. Homes that lack a usable cleanout often have one added precisely because it makes every future service call quicker and cheaper.
Cleanouts are also the doorway for a sewer camera inspection. When a line backs up repeatedly or before buying a home, a plumber runs a camera from the cleanout to see roots, breaks, or bellies in the pipe. A missing or paved-over cleanout is a real handicap during a backup, which is why installing one, especially a yard cleanout near the property line, is a common upgrade.
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- P-Trap : The U-shaped bend of pipe under every sink, tub and shower that holds a small pool of water to block sewer gas from rising into the room.
- S-Trap : An older S-shaped trap configuration, now banned by code, that can siphon its own water seal dry and let sewer gas into the room.
- Air Admittance Valve (AAV) : A one-way valve that lets air into a drain when needed but stays sealed otherwise, providing venting for a fixture without running a pipe to the roof.
- Trap Seal : The small pool of standing water held in a P-trap that physically blocks sewer gas from passing up through a fixture into the home.