Bob26. I assume that you emanate from USA as you mentioned faucets, we in Australia only have taps. I dont know about USA, but in OZ it is manatory if the shower head can hang into the bath tub. I know that you water runs the other way up there, cause we are upside down, but I believe that water still siphons, maybe better because ours has to run uphill. All that is required is a simple Air Gap valve fitted to the penetration where the hose screws on, these are normally supplied with a good quality handshower.