flap valve

noun

Origin:
1865–70

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Leaks in toilets can occur at the overflow pipe or at the plunger ball or flap valve on the bottom of the toilet tank.
Overflows must be screened or equipped with a flap valve to prevent the entrance of birds, animals and insects.
Overflow and drain lines are screened or protected with an angle-flap valve.
The sample is forced up the inside of the hollow tube and is held in place with a basket trap or flap valve.
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