Product Details: Prepare your semi truck to be Ready for the Road Ahead™, with the Apsco 4-Way Single Spool 2-Position Push-Pull Valve that allows for the easy buildup / release of hydraulic fluid. To ensure a vehicle has the necessary amount of hydraulic fluid or gases, this replacement piece allows operators to manually open or close the hydraulic lines. Fashioned with robust materials to weather extreme working conditions. FleetPride is your First Click in Heavy Duty®.