The patented Royal Flush Hydro-Vac utilizes the latest in marine toilet technology. A non-electric version of our Neoclassic and Superbowl, it’s designed for use with central systems. The push button on the toilet opens the adder kit to initiate the flushing process. Inside there are no moving parts, no pumps, motors, no maintenance! Each toilet has a 5 year warranty, all colors match Kohler fixtures.