Product Details: Ensuring Expertise Built In™, the OTR DV-2 Style Automatic Tank Drain Valve is a high-quality, durable drain valve designed to help prevent air tank damage by systematically removing water and oil build-up. This heavy duty air tank drain valve efficiently drains liquid build-up from the reservoir automatically upon accumulation to extend the life of your tank. FleetPride is your First Click in Heavy Duty®.