I am building a new house and am wondering if it is necessary to have a p-trap on the washing machine drain line.

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Originally Posted by tdk

I am building a new house and am wondering if it is necessary to have a p-trap on the washing machine drain line.

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Yes! By law every fixture that has a drain MUST be trapped and vented. If this isn't done you have opened your home to sewer gas. Good luck, Tom