The area containing a piping arrangement from a septic tank for the purpose of disposing unwanted liquid waste into the soil.

When two wedges acting as a closure member in a gate valve are in contact with the seating faces.

A tee made with easy (long-radius) curves between the body and branch.

The piping within a public or private premises that conveys sewage, rainwater, or other liquid wastes to an approved point of disposal immediately outside the building.

A watertight tank in a septic system placed between the septic tank and the distribution box and equipped with a pump or automatic siphon designed to discharge sewage intermittently to a disposal field so that rest periods may be provided between discharges.

Liquid and waterborne wastes derived from ordinary living processes that are free of industrial wastes and of such a character as to permit satisfactory disposal without special treatment into the public sewer or by means of a private sewage disposal system.

A pipe that carries rainwater from a roof to its ultimate point of disposal.

A usage percent applied to the water flow rate that lowers the connected load, used because not all fixtures will discharge simultaneously.

The volume or weight of a fluid, displaced by a floating body.

A valve having two ports to overcome line pressure imbalance.

Two changes of direction installed in succession, or series, in continuous pipe.

A type of fitting used in drainage systems with a wide radius that allows a smooth flow of wastewater with minimum obstructions.

Any pipe that carries wastewater or waterborne wastes in a building drainage system.

A motor-driven appliance that reduces food and other waste by grinding so it can flow through the drainage system.

Any piping running to a lower level.

A measure of the probable discharge of a fixture or device into a drainage system.

Gases that form ion components between molecules of a fluid or other substance.

The deviation between actual values over time and a predetermined value.

A location in the direction of flow from a referenced point.

Water primarily indented for direct human use, such as that supplied to plumbing fixtures.