Thetford 42209
Waste Ball Drive Arm Kit
Thetford 42209 is the waste ball drive arm kit for the Aqua-Magic Style II. The linkage that turns pedal movement into the waste ball opening. When it wears or breaks, the pedal still moves but nothing happens in the bowl.
Which models this fits
Aqua-Magic Style II
Verified against Thetford Parts List, Aqua-Magic Style II (Rev D).
What this does NOT fit
Aqua-Magic Style Plus. The Style Plus drive arm kit is 34090, not 42209.
Commonly confused with this
34090
34090 is the Style Plus waste ball drive arm kit. 42209 is the Style II one.
How to tell which one you have
Check the model sticker first. Thetford lists 42209 on the Style II parts list and 34090 on the Style Plus list.
Is this part still current?
Yes. Thetford still lists 42209 on its current parts list dated 11/4/2025.
Where to get this part
- Check price on AmazonSold by Amazon
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Check this before you order
- Confirm the model is a Style II.
- Check whether the seal also needs replacing while the toilet is apart.
Before you start the job
Waste-contact work. Gloves, eye protection, and disinfect afterwards.
Where our information comes from
We work from the manufacturer’s own documents. We have not installed this part and we do not test parts in a shop.
- Thetford Parts List, Aqua-Magic Style II (Rev D), dated 11/4/2025. Published by Thetford Corporation.
- Thetford Parts List, Aqua-Magic Style Plus (Rev E), dated 11/4/2025. Published by Thetford Corporation.
Last checked 2026-08-24.