flap trap

flap trap

[′flap ‚trap]
(engineering)
In plumbing, a trap fitted with a hinged flap that permits flow in one direction only, thus preventing backflow.

flap trap

In plumbing, a trap having a hinged flap which allows flow in one direction only, preventing backflow.
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References in periodicals archive ?
to supply aluminum structural assemblies for the Boeing 767 flap trap fairing.
If necessary, use flap traps that have a circular entrance.