installation required access to the back of my shower. Had the parts all been of the correct gender, this would not have required a big depot run. I had to change the water supply from male to female, also the stand pipe. The access to the back was caused by the wrong gender for the stand pipe and the little problem of not being able to remove the old pipe from the mixer valve. Everything worked out, except it is taking longer to repair the hole in the wall than the installation of the shower control. Works as described, wish I had control over the water pressure.