WebA backwater valve that is designed to be installed in a normally closed position is prohibited from being installed in a building drain or building sewer. Required Documentation No … WebThe NDS gravity flow Backwater Valve is designed to protect low areas or basements from the backflow of waste from street sewers. It is available in 2", 3", 4" and 6" sizes, PVC …
6+inch - Backwater Valves - Ferguson
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Oatey 4 in. PVC DWV Backwater Valve 439042 - The Home Depot
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