Plumbing Terminology

Front

Building drain

Back

The lowest horizontal pipe of the sanitary system.

Front

Pipe inside the building that conveys rainwater.

Back

Conductor

Front

A load amount on a plumbing system.

Back

Fixture unit

Front

Shower/tub fixture unit

Back

2 units

Front

Toilet fixture unit

Back

3 units

Front

The lowest point on the inside of a horizontal pipe

Back

Invert

Front

A small, covered opening in pavement

Back

Manhole

Front

A fitting that provides a water seal

Back

P-trap

Front

Siphonage

Back

The elimination of a trap seal

Front

Upper terminal

Back

Highest point of a horizontal drain