Prepare your semi to be Ready for the Road Ahead™, with the Chelsea Power Take-Off 12V Hydraulic Cartridge Valve that provides enhanced control of hydraulic system. To improve the quality of the PTO system, this replacement hydraulic works to control the direction, pressure, and flow of the hydraulic fluids. Fashioned with high-strength cast iron for enhanced durability. FleetPride is your First Click in Heavy Duty®.