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Thanks. I've just found this, which looks like it could be the right thing: http://www.plumbworld.co.uk/hepv0-self-sealing-waste-442-1788 It seems to say its designed to stop 'foul air' coming back into system..will it also work to prevent excess water coming back up into shower from...

I have a saniplus that has developed a problem, when you flush the loo, some water comes out into the shower tray. This is a new problem, so I don't think its to do with the installation being fautly. I've read around a few forums, and saw someone recommending to put a "hep20 horizontal...