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I didn't realise they could be installed horizontally, very useful.

As you have a combi i'm guessing that you have a thermostatic mixer valve. Have you checked that the hot and cold supplies are connected the right way around? Thermostatic mixers dont like the supplies connected round the wrong way, just a thought... :idea:

Does the bath water actually enter the shower tray? Or is it just a bubbling sound? If the trap just bubbles then it may well be siphonage as the bath water sucks the water out of the shower trap. The anti-vauum would need to be fitted to the shower tray and not the bath. They work by...