Thetford C2/C4 Toilet Cassette 20LThe Thetford C2 C4 Toilet Cassette 20L can not only be used as a replacement tank for the C2 C4 Cassette Toilet but also comes in handy for use as a second tank. And for easy transporting when emptying is required, it also features wheels and a pull out handle. NOTE: A C2 C4 tank is different to a C200 C400 tank, as they are different sizes and designed to fit and work with different style toilets, they cannot be interchanged Specifications include: