The C220 has Blue fittings, if your cassette does not have Blue fittings its not a C220.
From the Thetford Website:
Thetford Australia can provide a fresh-up set designed specifically for the C220 series of cassette toilets, eliminating the need for a complete replacement if a component becomes worn out.
This set includes a refreshed waste holding tank equipped with wheels and a convenient transportation handle for effortless manoeuvrability. The set also comes with a new seat and cover for enhanced comfort and hygiene. With its superior quality and easy installation, the Thetford fresh-up set for C220 cassette toilets is the perfect choice for those seeking practicality and long-lasting durability.
