Dual Flush Pro with Gate ValveClean your entire septic system with this reverse flush valve. Forces water backs up into plumbing lines to break up clogs in pipes. Allows you to backfill and flush black and grey water tanks, then reverse valve and flush sewer drain hose. Anti-siphon valve and complete valve assembly included. Patented.Features:A convenient way to clean the entire septic systemForces water back up into plumbing lines to break up clogs in pipesAllows to backfill and flush black and grey water tanksAnti-siphon valve and complete valve assembly includedClear, break-resistant polycarbonate adapters make it easy to see when the tank is done rinsing