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The purpose of an air admittance valve is to provide a method of allowing air to enter the plumbing drainage system without the use of a vent extended to open air and to prevent sewer gases from escaping into a building. An air admittance valve is a one way valve designed to allow air to enter the plumbing drainage system when negative pressures develop in the piping system. The device shall close by gravity and seal the vent terminal at zero differential pressure (no flow conditions) and under positive internal pressures.
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Explore STANLEY® hand tools and storage solutions at Preston Hardware.
Get faster, more accurate inspections with this rechargeable penlight with laser. Available at Preston Hardware.
With 23 options, this set offers a wide variety of sockets for all types of jobs. Get yours at Preston…
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