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Deleted member 267285
It’s a check valve (sometimes incorrectly called a non-return valve). Iirc they’re only required on certain machines, most now have an air gap to fill the water. Just research your machine if it needs one.
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Suddenly I've got no water upstairs, but no evidence of leaks anywhere
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Deleted member 212919
Thanks, wasn’t a very good check valve then, was happily letting water through the wrong way for 36 hours before deciding to stop it.
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Deleted member 267285
Aye, but could have been the mute nuts of check valves and just failed
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