I plan to move a lavatory into a small closet that is above a closet in my rental unit. So I figured I'd give the floor a lead pan and drain. The drain should always be dry. Reading an article in Consumer Reports I see they recommend a trap primer to divert a dribble of water from the supply line to the drain to keep the trap full. That seems like a waste of water. I had been thinking that some sort of check value would be available that I could use to keep the sewer gases from getting out. Is a trap primer the only option?
Don (e-mail link at home page bottom).