U.S. Plastic Corp.® carries an extensive line of 3 way valves. 3-Way valves are normally one valve, two flow patterns used to divert flow in process piping systems. The valves incorporate a unique design that permits them to be used for two completely different flow patterns. Valves can be installed so that the bottom port is the common or inlet port. The flow can be diverted 180 degrees, left or right, with a center off position.