Dometic/Sealand Sanipottie 974MSD Portable Toilet Tan-3.0 gallon (18.9 liter) waste holding tank *MSD fittings for optional permanent installation* Convenient top-mounted port for easy in-vessel filling of self-contained freshwater supply. Durable design- High density polyethylene construction provides strength and toughness, drop it, stand on it - this unit can take it! Attractive matte scratch resistant finish is easy to keep clean, looks new for years! Comfortable! Adult-sized seat and lid provide both comfort and safety, side latches lock firmly in place for added safety. Simple to winterize and maintain. All parts and seals are user replaceable. Comes with Mounting Brackets!!