With Expertise Built In , the OTR Purge Valve is designed to improve the efficiency of air-powered or pneumatic equipment. This valve is designed to remove water contamination from the air. Specifically designed for the AD-9 Air Dryer, it is easy to install and maintain. Improve the performance of air-powered equipment with the OTR Type 9 12V Purge Valve. OTR understands what it takes to repair and maintain Class 6-8 trucks, so they deliver solutions, making your job easier and more efficient. OTR warranties are comparable to or better than OE and top brands. All heavy duty truck parts offer the same form, function, and fit as the OE replacement parts. FleetPride is your First Click in Heavy Duty .