Camco 3" Waste Valve w/Metal Handle [39511]3" Waste Valve with Metal Handle Camco's 3 Inch Waste Valve with Metal Handle is a replacement waste valve for your RVs black and grey water tanks. It helps your RV sanitation system work properly. This waste valve is compatible with systems that require a 3 inch diameter passage. The valve's 3 inch diameter passage allows wastewater to travel freely when the valve is open. It features a metal handle for durability. The product includes (1) valve