Hi chaps... im new to the plumbing game so could do with a few tips and help as ive come to the conclusion that sales man in bathroom shops havent got a clue. Got a call of a customer to come and fit a mixer shower to a tiled brick wall with the pipes concealed. like the one below, sorry dont know how to do the link thing. www.screwfix.com/prods/74816/Bathrooms/Showers/Mixer-Showers/Thermostatic/Mira-Discovery-Dual-EV-Mixer-Shower I told her it could not be fitted to the wall because it has a tap connection thread with a washer and she needs one with a compression with an olive. Now i could put a 90 bend tap connection and solder onto the 15mm copper pipe but it means me chasing one big hole in the brick, but even then i wouldnt be able to get to the nut as it would be in the tiled wall. The chrome covers for the nut dont go all the way to the thread so as i said the nut would be in the wall. Id like to know am i right? as she says the man who sold her the shower says im wrong. If im right how do these showers fix to a plaster board wall, is there a plate or something to put behind to hold the mixer valve? Be grateful if anyone can shed any light on the issue.