Get your semi truck Ready for the Road Ahead with enhanced control of the multiple fluid pathways, with the Gresen 1"-1/2 NPT 2-Position Selector Valve. With a sophisticated design, this replacement components allows operators to choose the flow of fluids from one location to the next. Manufactured with top-tier materials to operate in conditions ranging from -40 °F to +200 °F. FleetPride is your First Click in Heavy Duty .