The Thetford Porta Potti is built from high quality plastic which is durable and easy to clean. The many innovative operational features of the toilets are designed to make life easier. The inherent quality of manufacture ensures that Thetford portable toilets will last many years. 382mm (deep) x 342mm (wide) x 315mm x (high) Fresh tank capacity - 10 litres Waste tank capacity - 10 litres Waste tank level indicator The 335 is especially compact, making it ideal for use in many motorhomes or where you just don't have the space for a bulky loo! Don't forget your chemicals!