• You may have a knackered TMV on the mixer. If they still make the replacements then swap it out. Which you know.

    Take it out and show it to a plumbers merchant to see if they recognise it or Google any part numbers on it.

    Put check valves on the hot and cold. Stops water going the opposite way.

  • If the mixer is faulty non return values won’t make a diffrnece.

    Having never worked on a shower like that yet and never seeing anything like that in the merchants. I think you’ll struggle to get a replacement, probs best online.

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