Drain your RV waste water in half the time with the Valterra Ell Double Rotating Valve! Eliminate the mess with your old RV plumbing valve. This valve allows you to drain gray and black water tanks simultaneously, saving you time and effort. Integrated bayonet-style cap covers lug fitting when not in use. Sturdy black ABS plastic construction makes the valve durable for years of use. So easy to use, the Valterra Double Rotating Valve is perfect for any RV, camper, or trailer owner. The 3" x 1.5" hub attachment fits many standard RV's. ABS solvent cement (sold separately) required for installation.