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:o( Oh dear, Mr Posy doesn't think that IS what we need, Builder, He says he thinks it is the threads on the part that the pipe screws onto which are worn, and we can't get to it, there is only about an inch coming out but it seems to be part of a much bigger unit, which is why he mentioned the back coming off. The pipe and connection are fine- we were hoping there was some 'gunk' we could buy to make it waterproof. Maybe we had better look for a plumber? Thanks again- rosy