Brass stop & waste valve. A great multi-purpose in-line valve for residential and commercial uses. ProLine Series Stop & Waste Valves are designed to stop or regulate the flow of water running through the valve in low-pressure lines. The screw-on waste cap allows flushing of the line when the valve is closed for maintenance. Operation of this valve is easy due to it's multi-turn handle and is built with a brass body for durability and long operational life.