Haliburton Lumber
IPEX 17009 Backwater Valve with Threaded Cap, 1-1/2 in, Hub x Hub x MPT, ABS Body
A backwater valve is a device that prevents sewage in an overloaded main sewer line from backing up into a building basement. The valve will automatically close if sewage backs up from the main sewer and will remain closed until the line is clear.

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