Cleanout

A cleanout is a capped fitting installed in a drainage system to provide direct access for inspection, snaking, or hydro-jetting. The fitting is typically a Y or combination wye-and-eighth-bend with a threaded plug or screw cap. When a stoppage occurs, the plug is removed and a cable auger or jetting nozzle is fed into the line without cutting pipe or removing fixtures.

The International Plumbing Code (IPC) § 708 and the Uniform Plumbing Code (UPC) chapter 7 specify where cleanouts are required. In general terms, a cleanout must be located at the upper terminal of every horizontal drain run, at every change of direction greater than 45 degrees, at the base of every stack, and at intervals not exceeding 100 feet on horizontal piping 4 inches and smaller. Larger pipe is allowed longer spacing. A two-way cleanout is also required where the building drain meets the building sewer, often inside a yard cleanout box at grade.

Cleanouts come in two general categories. Indoor cleanouts are usually located in floors, walls, or accessible chases and are sized to match the pipe they serve, with a minimum of 1.5 inches for fixture branches and 4 inches for building drains. Outdoor cleanouts terminate at or above grade in a protective box and are the preferred entry point for sewer-line work because they avoid pulling toilets or removing trap arms.

Material selection follows the host pipe. Cast-iron systems use brass or cast-iron plugs with square or hex heads, ABS and PVC systems use solvent-welded plastic plugs, and copper DWV uses cast brass. Threaded plugs should be installed with pipe-thread sealant rated for DWV use so they can be removed years later without breakage.

Maintenance is minimal but specific. Plugs should be checked for corrosion or paint-over during any service call, and threads should be cleaned and re-doped after each opening. If a cleanout is buried, paved over, or absent at a code-required location, adding one is a common scope item. Typical pricing to install a single yard cleanout on an existing 4-inch lateral runs roughly 400 to 1,200 dollars depending on excavation depth, surface restoration, and pipe material. Interior wall or floor cleanouts retrofit higher because of finish work. Properties built before modern codes frequently lack a two-way cleanout at the property line, which complicates camera inspection and forces drain technicians to enter through a roof vent or pulled toilet, both of which lengthen the job and raise the bill.