Product Details: The Bendix AD-9 Air Dryer Check Valve Kit is the ideal choice for your air dryer system. This kit includes a check valve, mounting bracket and all necessary hardware for a quick and easy installation. The check valve is made from durable materials and is designed to resist wear and tear, ensuring long-lasting performance. It is designed to prevent air from flowing back into the air dryer, helping to maintain the air pressure in the system. FleetPride is your First Click in Heavy Duty®.