DIYbanter - View Single Post - dishwasher & washing machine waste on sink trap

wrote:

Screwfix and local hardware shop don't seem to have non-return valves
to fit in line.

I bought two from Wickes, but it was a while ago...
We also have both appliances connected to a twin spigot on the sink and
everything seems to work fine.
The sink drain is a short 40mm waste pipe to external hopper, if that
makes a difference.

Lee
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