“I have old pipes in my house that are 1.5". Some washing machines have too much drain force. Will this work with 1.5" drain pipes?”
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While 1.5 inches is the absolute minimum in some, 2 inches is the required standard for most new installations. While some older building codes may have allowed a 1.5-inch standpipe for washer drainage, modern plumbing codes (such as the Universal Plumbing Code) typically require a minimum of a 2-inch diameter pipe to handle the high flow rates of modern washing machines and prevent overflow. Using a 1.5-inch pipe with the Energy Star® Certified LG 4.5 Cu. Ft. High Efficiency Stackable Front Load Washer with 6Motion™ Technology - White Model # WM3400CW, may cause slow drainage, noisy, gurgling sounds, or frequent clogs. The drain must be installed in accordance with any applicable local codes and regulations, so you may want to consult your local building inspector about whether you will have to upgrade to a 2-inch standpipe...^Ivan.
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