I have 1/2" supply comming from shower valve shower valve is desinged for shower and spray jets. two water control valves the control valve for the spray jets has two outlets the valve is a moen 3 fuction control w/3 port cc w/stops.I would like to know if i can use the valve as my bath fill supply? DO you have any suggestions for a waterfall fill. I've been playing around w/some ideas I took a 1/2" supply to a 2 1/2" pipe.I have sufficient water flowing from top 2 1/2" pipe. My next step is to come up w/resevoir that sits on top of 2 1/2" pipe I was thinking copper>any suggestions?How do i drain the water left in fill line after valve is turned off?? thankyou