Replacement Waste Ball Drive Arm Kit For Thetford Aqua-Magic Style II 42050

Updated 10/26/2026 | Published 10/24/2026

Question:

Will this part fit my Thetford toilet with this label on the back of the unit “21)510-42050-0203”-I’m assuming that it is a model 42050, but am unsure.

asked by: Caroline K

Expert Reply:

Hey Caroline! The Replacement Waste Ball Drive Arm Kit # TH34FR53CF is the correct replacement for Thetford Aqua-Magic Style II toilets. The 42050 on your label is the model number, and confirms you have an Aqua-Magic Style II. The # TH34FR53CF (42209) is what you need to get your toilet up and running again.

What kind of RV or trailer do you have?

expert reply by: Robin H