Outfit your semi truck to be Ready for the Road Ahead™ with enhanced protection against excessive hydraulic pressure, with the Permco 1" NPT Direct Acting In-line Hydraulic Relief Valve. Due to its ability to expel fluids as needed, this replacement valve is the ideal option to protect a hydraulic system from extreme pressure buildup. Constructed with a gauge port for accurate relief diagnostics. FleetPride is your First Click in Heavy Duty®.