Do you really need to elevate the drain hose of the washing machine? Why do manufacturers say so? - Quora
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Water Softener Air Gap for installation in Washing Machine box with 2-inch Drainpipe (61-S, GAP-IT, AG140-001) - - Amazon.com
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AG140-001 Water Softener Air Gap for installation in Washing Machine box with 2-inch Drainpipe | AirGap International
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