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Oatey 39016 Sure-Vent 1.5" to 2" 20 DFU AAV w/PVC adapter (Schedule 40). The construction of this product comprises a specific one-way valve, which allows air insight in a drainage system and retains sewer gases inside at the same time. Thought-through characteristics of the given air admittance valve allow to ensure a high-quality ventilation and make the use of a vent extended to open air unnecessary. With the negative pressure developing in the system, the valve allows air to get inside the plumbing drainage, and under the conditions of zero/positive internal pressures the vent is closed and sealed by gravity.
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