1, Injection molded, freeze resistant, tough thermoplastic construction 2, Easy to clean, smooth ... camping,hospital,Caravan,boats,costruction working sites,beadhouse etc.1, Injection molded, freeze resistant, tough thermoplastic construction 2, Easy to clean, smooth ... compartment 7, Holding tank vent for cleaner and easier discharge of waste 8, Water tank holds 15L, waste tank holds 21L ...