31 heavy duty plastic gravity-flush RV toilets offer powerful action that removes waste completely, plus a watertight flush ball system that keeps water in the bowl and odours in the holding tank. These toilets feature efficient foot pedal operation with an adjustable water level. Ultra-lightweight 30 series toilets replace any standard-height RV toilet (two-bolt, four-bolt, and angled two-bolt styles). Some installations of these RV toilets may require a floor flange adapter kit, available separately. Low profile, space saving.