Cassette Toilet
A toilet with a removable waste container that's emptied at any sewer or restroom rather than at a dump station. Common in Class B and small Class C.
Also called: cassette toilet, removable cassette, portable toilet
A cassette toilet is a toilet with a removable waste container (the “cassette”) that’s emptied at any sewer connection or restroom rather than at a dump station. Common in Class B camper vans and small Class C motorhomes where space for a full black tank doesn’t exist.
How it differs from a standard RV toilet
| Standard RV toilet | Cassette toilet | |
|---|---|---|
| Waste storage | Built-in black water tank | Removable cassette |
| Capacity | 25-50 gallons typical | 4-5 gallons typical |
| Emptying | Dump station required | Any sewer connection or restroom |
| Refilling | Add water + tank treatment | Add water + cassette-specific treatment |
| Frequency | Every 4-7 days for 2 people | Every 1-2 days for 2 people |
How emptying works
- Open the cassette compartment (usually on the exterior of the RV)
- Pull out the cassette (handle on top, locks with a lever)
- Carry the cassette to a toilet or sewer cleanout
- Pour the contents in
- Rinse the cassette with fresh water
- Add cassette treatment
- Reinsert into the compartment
The whole process takes 5-10 minutes once you’ve done it once.
Why cassettes exist
In a Class B camper van, there’s no room for a 25-gallon black water tank, the plumbing to connect it, or the exterior drain port. The cassette occupies a 12” × 12” × 24” footprint and accomplishes the same job.
The trade-off is more frequent emptying. Cassettes hold 1-2 days of waste vs. 4-7 days for a standard tank.
Where to empty in practice
- Campground restrooms — most campgrounds allow cassette dumping in the restroom
- Public restrooms at parks, gas stations (ask first)
- Sewer cleanouts at home (residential dumping is fine)
- Truck-stop dump stations — yes, but inefficient (designed for larger volumes)
Brand notes
The standard cassette is the Thetford C200 series. Some pop-up campers use Porta Potti cassettes. Both are interchangeable in concept.