Hi, just finishing installing shower mixers and trying to stay one step a head of the plasterers. the shower mixers have two wall mounted outlets - one rainfall head and one shower hose. They both have half inch threaded connectors for the pipe which has washers and a nut that fixes to the rear of the board that will be tiled. I was saying to the plasterers we can't board the back of the stud wall behind the showers until we have tiled the shower area - as there will be no way to access the nut