The intuitive simple to use Twist Lock handle works by locking the redesigned piston assembly into place helping to prevent back flow of any waste water into the bowl. The manual toilet also features a rotating outlet nozzle angled powerful self priming pump and the comfortable handle and easy to use flush control. This coupled with the easy to clean crevice free design still makes Jabsco the number one manual toilet manufacturer in the world. Dimensions: 16-3/4 D x 17-3/4 W x 13-3/16 H.