Flush King, Torrance, CA, presents the reverse RV flush valve that provides a quick and effective way to fill, rinse and remove remaining residue after dumping the black or gray holding tanks. Flush King has four locking hooks to provide a tight seal to guard against leakage. The handle swivels 360-degrees to make hook-up and operation easier. The Flush King eliminates wands and hoses inside the RV, rapidly refills the holding tank at any height or angle of plumbing, improves sensor performance, removes clogs in drain pipes, and is clear so the user can see when the tanks are completely clean of residue. Flush King fits most trailers, fifth wheels and motorhomes and is not a permanent attachment -- it twists on and off easily.