soil pipe

a pipe carrying wastes from toilets and sometimes from waste pipes. Compare waste pipe(def 2).

Origin of soil pipe

First recorded in 1825–35

It is usual in modern plumbing to relieve the pressure of gas in the soil-pipe by what is called a "stench-pipe."

Village Improvements and Farm Villages |George E. Waring
There should be no trap in the soil-pipe, and no trap in a private drain between the outlet of the soil-pipe and the sewer.

Village Improvements and Farm Villages |George E. Waring
This soil-pipe weighs about ten pounds per foot and is almost always four inches inside diameter.

Rural Hygiene |Henry N. Ogden
Two-inch tin vent from bend of soil-pipe carried with various angles into cold chimney flue.

Scientific American, September 29, 1883 Supplement. No. 404 |Various

The only kind to use are short-hopper closets with a trap that opens into the soil-pipe above the floor.

Essays In Pastoral Medicine |Austin Malley

soil pipe

a pipe that conveys sewage or waste water from a toilet, etc, to a soil drain or sewer