The Buyers Products part number HSV050 is a 1/2 Inch NPTF Two-Position Selector Valve. This hydraulic valve is designed to redirect oil flow from one application to another, even under full line pressure, making it ideal for systems like dump trucks that pull separate pup trailers. It operates with a push-knob that diverts pressure from the seal, allowing the spool to shift, and is rated for a maximum pressure of 3000 PSI.