Product Details: The SKF 3.75" x 1.75" Air Dryer Valve Kit is designed to help remove moisture and contaminants from the air supply, improving the quality of the air delivered to the system. This can lead to better performance and reduced energy consumption. The valve is both made from durable materials for long-lasting use. The valves are easy to install and can be used in a variety of applications. With this kit, you can ensure that your air supply is clean and free of moisture and contaminants. FleetPride is your First Click in Heavy Duty®.