Last edited 13 Jul 2021


In its broadest sense, the word ‘trap’ refers to a something that catches and holds things.

The 2018 International Residential Code (IRC), published by the International Code Council (ICC) defines a trap as: ‘A fitting, either separate or built into a fixture, that provides a liquid seal to prevent the emission of sewer gases without materially affecting the flow of sewage or wastewater through it… The trap seal is the maximum vertical depth of liquid that a trap will retain, measured between the crown weir and the top of the dip of the trap.’

The word trap can also refer to a two-wheeled carriage pulled by a horse.

See also: Boulder trap.

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