The Clesana C1 with L-Adapter is a retrofit kit that allows you to replace certain cassette toilets—like the Thetford C220 and C260—with the Clesana C1 waterless sealing toilet. The L-shaped base is designed to cover the mounting holes left behind by the removed toilet, giving you a clean, finished installation without floor modifications.
The L-Adapter is confirmed compatible with the Thetford C220 and C260. For other models, download the Clesana Compatibility Matrix to check whether your specific toilet is supported before ordering.
The toilet unit itself is identical—same sealing technology, same operation, same liner system. The difference is the base. The Round Base is for new installations where no toilet was previously mounted. The L-Adapter is for retrofit situations, covering the existing floor holes from a removed cassette toilet like a Thetford C220 or C260. If you're replacing an existing toilet, order the L-Adapter. If you're doing a fresh install, order the Round Base.
The L-Adapter is specifically designed to cover the mounting hole pattern of the Thetford C220 and C260. For other toilet models, check the Compatibility Matrix before purchasing to confirm fit.
The Clesana C1 automatically seals waste into individual disposable pouches using a foil-like liner—no water or chemicals needed. Each pouch is heat-sealed after every flush to prevent odors and leaks. Pouches are stored inside the toilet until full, then disposed of in a standard trash container. No dump station required.
No. The Clesana C1 is 100% waterless and chemical-free. No plumbing connections are needed—just an electrical connection for the sealing mechanism. This makes it especially practical for retrofit installs where running new water lines would be difficult.
Each liner pack averages about 40 uses, depending on which flush size you select. Refill packs are available here.
Yes—installation requires a professional or someone with solid electrical experience. No new plumbing is needed, but the Clesana C1 does require a proper electrical connection. Installation and operating instructions are included, and PDF versions are available in the Downloads section above.
Yes. The Clesana C1 with L-Adapter is sold through EuroCampers.com and ships from Imperial, Missouri (near St. Louis). If it's currently out of stock, a waitlist is available on this page.
Yes. Because the Clesana C1 requires no water or chemicals, it's an excellent choice for off-grid travel. The retrofit L-Adapter makes it easy to upgrade an existing cassette toilet installation without any plumbing work.
