The Haldex 1/4" NPT Inlet Port 65 psi One-Way Check Pressure Protection Valve is designed to delay filling one or more reservoirs until the preset pressure in the primary or braking reservoir is reached. This valve allows air to be shared between two reservoirs above the closing set of the valve and is available in a variety of factory pre-set pressure settings. It uses premium-quality materials for superior durability and has a maximum operating temperature of 200 °F. This valve is ideal for applications where precise pressure control is required. FleetPride is your First Click in Heavy Duty®.