Information on dimensions and types of Thetford locker doors :
Waterfiller Door, SD3 FD3, SD4, SD5 FD5, SD6, SD7
Waterfiller Door - A door used for filling the water in your Thetford cassette toilet
SD3 FD3 - Compact standard door for cassette toilets
SD4 - Typically used to access gas cylinders and water tanks
SD5 FD5 - Used for access to water tank or general luggage door
SD6 - Used for access to storage area or general luggage door
SD7 - Used for access to large storage areas