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