allseason Posted January 21, 2015 Report Share Posted January 21, 2015 Can a wash. mach. drain be directly connected to a waste line with only a check valve, mounted horizontally, no trap. Here's what the owner's plumber states: Looking at the picture of the washing machine drain connection you sent reminds us of your washing machine set up. Your drain connection is acceptable and was common in older homes where the piping conditions prevented the installation of a stand pipe. No trap is needed because the drain hose is connected directly to the drain piping of the house and no sewer gases can escape. There is a check valve on the drain connection and the check valve prevents water from backing up into the washing machine. The washing machine has been connected in this manner for many years and works fine. No repair or re-piping is needed. Thanks, Chris Quote Link to comment Share on other sites More sharing options...
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