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Should I seal the washing machine drain hose to the standpipe?
Friday, July 6, 2018
A standpipe is the drain pipe behind a washing machine that rises about three feet above the floor. It may only be visible as a hole in a washing machine faucet box in the wall of newer homes. Although it seems to make sense to seal the connection between the washing machine drain hose and the standpipe, the plumbing code requires an air gap to avoid a vacuum-induced siphoning of the water out of the washing machine. The washing machine hose should be hooked into the standpipe and secured from backing out, but the small gap around the washing machine hose inside of the standpipe should remain open to allow air into the pipe connection to break any vacuum that might otherwise be created during draining. The photo above is an example of how not to do it, and the one below shows a typical installation at a faucet box with a zip-tie securing the hose into the stand pipe.
Also see our article Frequently Asked Questions (FAQ) about Laundry Areas
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