The PP-5 Style Trailer Supply Valve is a precision-engineered and manufactured product designed to deliver optimum performance for each specific application. With its all-brass construction, this valve ensures years of dependable and trouble-free operation. Unlike remanufactured options, this valve is brand new and comes with a mounting nut for easy installation. Primarily used on tractors, it provides modulated control on trailer brakes. The valve features an automatic pressure release of 40 PSI and has a stem diameter of .377". With a 1/8" PT supply, 1/4" delivery, and 1/8" PT control, it fits most makes and models.