| 摘要 |
An air admittance vent including a housing having a base and a cap with a diaphragm assembly disposed therein. The assembly comprises a diaphragm base, an annular retainer ring, and an annular malleable washer. The diaphragm base has an annular portion and a stem extending orthogonally from the center of the annular portion. The annular retainer ring includes a circumferential skirt engaged with an outer perimeter of the annular portion of the base, with the stem extending beyond the annular retainer ring. The annular malleable washer is disposed between the annular retainer ring and the annular portion of the base. A member extends from the housing base into engagement with the stem for guiding movement of the diaphragm assembly to open or close an ambient air passage through said housing base.
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