This Thetford C234 Fresh Up Kit is designed to refresh your C2, C3, or C4 cassette toilet. It includes a new waste tank with wheels and a handle for easier emptying. The kit also contains a toilet seat with lid, Thetford Bathroom Cleaner (500 ml), and Thetford Cassette Tank Cleaner (1 litre). This specific set is for the left-hand fitting version of the toilet. To determine if you need the left or right version, consider the location of the cassette access door when you are seated on the toilet. If the door is on your right, you need the right-handed version; if it's on your left, you need the left version.