Automatically flush, scrub and vacuum carpets in one pass, with our Marathon units. Unlike all other units, these cleaners utilize a clever patented internal bladder design system that maintains constant brush pressure on the surface regardless of the position of the water in the tank. In addition, the bladder design has allowed us to shrink the "footprint" of the unit to allow for easier transport, storage and better sight lines for the operator. In short the state of the art, user friendly and easy to service design has made these units one of our most popular sellers. Cleaners come in both 8-gallon (98166) and 12 gallon (98168) sizes.