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Updated: May 5, 2025
If the soil-pipe is open at its upper end this expansion will be at once relieved; but if the top of the pipe be closed there will always be danger of the forcing of the feeble barrier offered by the ordinary water-seal trap of a branch pipe leading from a wash-basin or sink.
Water-seal traps which are unused for any considerable time are emptied by evaporation, and thus open a channel through which the air of the soil-pipe may find its way into the house. It is usual in modern plumbing to relieve the pressure of gas in the soil-pipe by what is called a "stench-pipe."
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