Ensure your semi truck is Ready for the Road Ahead™ with advanced control of its hydraulic system, with the Chelsea 340-351 Series Power Take-Off Air Control Valve. To provide crucial hydraulic power to various different components, this replacement allows operators to choose the flow of the air to the PTO mechanism. Fashioned with a spring-loaded lockout safety knob to prevent unintentional lever movement. FleetPride is your First Click in Heavy Duty®.