Just about to fit this Hansgrohe controller and wondered if anybody has fit one of these? I am just dithering (as we self-builder's do) because the two inlet connections which are the yellow discs are 3/4" and the two outlets are 1/2" which go th the shower itself. I have fitted 15mm supply pipes but the bit I am dithering over is should I have run 22mm seen as it is 3/4" or am I just over thinking it. I think I need to just get the appropriate fittings and use the 15mm pipe seen as I am using 15mm from the controller to the shower. TIA