Prepare your semi truck to be Ready for the Road Ahead , with the Bendix 3/8"-18 NPT DV-2 Brake Automatic Reservoir Drain Valve that rapidly removes excess water, oil, and air from a vehicle's air tanks. By utilizing a sophisticated design, this replacement valve is able dispel excess moisture before it can cause damage to an air brake system. Constructed with a pressure and heat-resistant body to prevent accidental leaks. FleetPride is your First Click in Heavy Duty .