DIY Doctor

Dishwasher and Washing machine waste fitting with no trap

Postby Angusb » Thu Feb 17, 2011 2:07 pm

I've had the entire kitchen plumbing (and everything else in the kitchen) re-done and for the waste of the dishwasher and washing machine there is no trap and just a rubber flange that fits on the end of the waste pipe with the washing machine hose feeding into that.

Has anyone come across this use before where space is tight and is it good practice? my feeling is that capillary action will cause water to creep back up the washing machine hose and large discharges are likely to just spill out of the waste pipe.

I have tried to find these fittings online but haven't been able to so flange might not be the right term they are almost like a rubber reducer from 40mm to slightly larger than dishwasher hose width with an inch of constantined rubber which i guess is meant to stop small amounts of water leaking out.
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