This portable toilet is suitable for interior and exterior use. It is self-contained and it doesn’t require any external water or power connections. It consists of two separate tanks; a fresh water holding tank of 12Lt capacity and a waste holding tank of 10Lt. However, you can change the waste tank’s capacity to 20Lt, by replacing the 10Lt waste tank with the 20Lt waste tank (Ref. 11869). The toilet is made of high-density plastic with matt finish for greater resistance to scratches.