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I have seen two types of washing machine valves, with and without check valves. What is the purpise of the check valve?
https://www.bes.co.uk/washing-machine-tap-with-check-valve-15mm-x-3-4in-10334
https://www.bes.co.uk/washing-machine-tap-with-check-valve-15mm-x-3-4in-10334