FAQ - Frequently asked Questions

  1. Which toilet model do I have and for which models is there a flexaport insert?
  2. Flushing: does the built-in water flushing still work?
  3. Size of the containers
  4. Material: PVC vs. Acrylic
  5. Bags: odor proof / compostable
  6. Twusch
  7. flexaport with children - does it work?
  8. further questions

1. Which toilet model do I have and for which models is there a flexaport insert?

Generally, the offered flexaport inserts really only fit into the corresponding models.

Permanently installed toilets

There are flexaport inserts for Thetford and Dometic models for the permanently installed toilets in vans/mobile homes/caravans.

The type plate of the toilet is usually attached to the slot / shaft of the cassette. It is often covered by the cassette so that it has to be pulled out.

Otherwise there is a type plate on the cassette.

Portable toilets

In the case of mobile camping toilets (Porta Potti, etc.), the model is normally printed or shown on a type plate. Otherwise you can send us a photo of the toilet together with its dimensions by email to info@flexaport.de - we will then try to find out the model.

2. Flushing: does the built-in water flush still work?

Yes. When the insert is in place, the flushing water runs over the outside of the insert (as on the previous flushing rim) and then flows into the bowl at the end of the insert to flush the urine into the cassette.

If you don't like the container getting a little damp from (fresh) rinsing water, you can remove it during rinsing. The flexaport insert can remain permanently in the toilet.

However, we recommend to not using the normal water rinse and instead spraying the last drops of urine into the tank with Solbio or citric acid from a spray bottle (e.g. from an empty glass cleaner). This has the advantages that

  • water is saved (the tank does not fill up with flushing water as quickly)
  • the urine does not start to stink that quickly (urine reacts with the oxygen - stinking ammonia is formed)

3. Size of the containers

NEW: the flexaport inserts have all been revised in 2023 and are now supplied with the new black flexaport container (1.15 liters, polypropylene).

With the 2022 flexaport inserts, the models for the Thetford C220 and Fritz Berger Supreme were supplied with the black rubber container (1.15 litres). All other models were supplied with the smaller white/transparent 0.8 liter container.

4. Material: PVC vs. Acrylic

Some flexaport inserts are offered in both PVC and acrylic.


The standard inserts are made of PVC and are extremely resistant to chemicals.


The acrylic inserts are very hard and therefore resistant to scratches. The surface of the acrylic inserts is frosted and looks GREAT!

In the pictures, the PVC insert is on the left/back and the acrylic insert is on the right/front:

black pvc / acylic

black pvc / acylic

white pvc / acylic

5. Bags

5.1 odor proof

The odor-proof bags consist of a technically complex, multi-layered barrier film and can be sealed with a small rechargable sealer. This means that the filled bags can be stored for several days. Due to the material thickness of 50 my, these bags cannot be knotted.

The odor-proof bags can either be placed individually in the container or used as a collection bag for several thin bags.

5.2 compostable bags

The "compostable bags" available which are available on the market sound "green", but unfortunately they are not. These can only be composted under industrial or laboratory conditions (after 12 weeks at 60 degrees, 90 percent must have broken down into parts smaller than 2mm). Such conditions are not found on any home compost.

If degradable bags (under "normal conditions") are actually available at some point, that would be an optimal solution. We would be very happy to receive relevant information.

The included bags are very thin and yet tight. The standard bags weigh 1.8 g per piece - that's really very little plastic. In addition, if properly disposed, the plastic is incinerated in the residual waste and thus used to generate energy and heat.

When considering the ecological balance in its entirety (from production over use to disposal), the use of a flexaport insert is significantly better than many "real" dry composting toilets: in 3,000 (!!!) sessions, around 5 kg are lost in the form of the above-mentioned plastic bags consumed - most TTTs available on the market are manufactured of more plastic (the disposal of the old toilet on top). If garbage bags are used to collect the solids in a composting toilet, it uses even more plastic. Compared to the chemical toilet, there is no need for chemicals or disposal trips.

Alternatively, paper-inserts can be placed into the flexaport container and collected in a separate (closed) waste bin.

6. Twusch

The flexaport insert is compatible with the Twusch insert, as this is put into the toilet bowl below the flush rim, the flexaport insert is above.

7. flexaport with children - does it work?

From our point of view: a very clear "YES". We have been using the flexaport for a number of years with our small children and it worked great.

8. Further questions

Just contact us via the contact form or by email to info@flexaport.de