Camco’s 3-Inch RV Sewer Waste Valve allows you to replace or add a gate valve connection to your RV s black/grey water sewer tanks. It is compatible with 3-inch RV sewer pipes. The 3-inch diameter passage allows waste water to travel freely when the valve is open. This product includes (1) valve body with plastic handle (2) seals and installation hardware. The gate valve is constructed of durable ABS material. Simple to install it connects to your RV s existing sewer pipes.