• The internal vent is designed to release gas back into the cassette chamber
• The external vent is designed to release gas into a connected hose that is pre fitted to your service door
• Suits Thetford C223 S / C223 CS / C224 CW cassette toilets

As a replacement cassette or as a spare back-up cassette while you are on the road, the Thetford C220 Toilet Cassette with either an Internal or External vent is the waste holding tank for the Thetford 200 series toilets

• 18L Capacity
• Weight: 2.2kg
• Built-in rotating empty spout
• Wheels & pull handle for easy transport