air admittance vent
（ plural ）
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(plumbing) a mechanical sewer vent that allows air to enter into the sewage system but does not allow exhaust of sewer gases, to aid the flow of sewage by providing air behind water, where a standard vent stack to atmosphere is not possible, by drawing in interior air but keeping harmful sewer gases contained.
air admittance vent
When installing a kitchen island where a standard vent stack to the roof was not possible, the plumber installed an air admittance vent to allow air into the drainage system without letting sewage gases escape.
When installing a kitchen island where a standard vent stack to the roof was not possible, the plumber installed an air admittance vent to allow air into the drainage system without letting sewage gases escape.
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