The LaSalle Bristol 39240 Waste Valve Kit is designed as a replacement for your RV's existing black water tank waste valve. It features a 3" opening, allowing waste water to flow freely from your RV without hang-ups or slowdowns when the valve is open. The ABS plastic body and stainless steel shaft provide years of durability and consistent operation. The kit includes one valve body, seals, and all necessary hardware for installation.