The Barker Auto-Drain RV Waste Valve allows you to dump your RV's gray water tank by just pushing a switch. It can be mounted on the slide valve of a 1-1/2" waste valve, providing consistent power and extending its life. Adjustments or clamps are not needed for the installation.• Auto-drain makes it easier to get to small valve areas that are difficult to operate• Easy manual operation in case your RV battery is low or you run into valve complications• Hard-wearing steel, aluminum, and plastic construction• Corrosion resistant for long extended use• No supplemental plumbing fittings to install• Auto-drain opens and closes automatically• Highly recommended to empty your holding tank prior to installation to avoid messes• Red light switch alerts you when the Auto Drain is open or opening• It's not necessary to remove valves to install Auto-Drain• Fits Valterra and Bristol 1-1/2" waste valves• Voltage: 12V DC• Amperage: 150 mA• Cycle Time: 3 seconds• Comes complete with mounting bracket, rocker arm switch, switch box with light, complete installation, and operating instructions No adjustments or clamps are needed for installation Hard-wearing steel, aluminum, & plastic construction Fits Valterra & Bristol 1-1/2"" waste valves | Barker 24140 Auto-Drain RV 1-1/2" Grey Water Waste Valve in Red