Would a Hepvo valve be a possible solution?
Any downsides? (Apart from its size... there's only about 100mm to play with in the current pipework so some re-jigging would be required).
Cheers
GP
We have a Wickes anti-siphon valve connected to our kitchen sink waste (Wickes no.424904) to stop the dishwasher & washing machine sucking the water out of the sink trap.
However, while this works fine during normal emptying of a full sink, the valve leaks if the waste disposal unit is run. The...
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