Verified Compatibility

Thetford 42209

Waste Ball Drive Arm Kit

Thetford 42209 is the waste ball drive arm kit for the Aqua-Magic Style II and Aqua-Magic Residence. 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.

Is it compatible?

Compatible with

  • Aqua-Magic Style II
  • Aqua-Magic Residence

Not compatible with

  • Aqua-Magic Style Plus

Every model above is named in a manufacturer parts list, cited in full further down this page.

Current eBay listings for Thetford 42209

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eBay carries exact OEM numbers, discontinued parts and old stock that general retailers drop, which is usually where a part this specific turns up.

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Compatible models, and the document that says so

  • Aqua-Magic Style II

    Verified against Thetford Parts List, Aqua-Magic Style II (Rev D).

  • Aqua-Magic Residence

    Verified against Thetford Parts List, Aqua-Magic Residence (Rev D).

Not compatible with

Aqua-Magic Style Plus. The Style Plus drive arm kit is 34090, not 42209.

Commonly confused with this

42209 compared with the numbers it is confused with
42209this page34090
FitsAqua-Magic Style II, Aqua-Magic Residence—
PartWaste Ball Drive Arm Kit—
Interchangeable—No
  • 34090. 34090 is the Style Plus waste ball drive arm kit. 42209 is the Style II one.
Superseded by, versus commonly confused withTwo rows. The top row shows 617748 with a solid arrow to 619068, labelled superseded: the manufacturer says to use the new number instead. The bottom row shows 42141 and 34120 side by side with a crossed link, labelled commonly confused: two different current parts that are not interchangeable.SUPERSEDED BY617748619068order this oneCOMMONLY CONFUSED WITH4214134120both current,neither replaces
Superseded by, versus commonly confused with

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. 42209 is listed in Thetford Parts List, Aqua-Magic Style II, Rev D (11/4/2025), which is the current parts documentation we hold for this model.

Also worth having before you start

  • Disposable nitrile gloves

    General guidance for any waste-contact job, not specific to one manufacturer: wear protective gloves and eye protection when you touch anything that has been in contact with human waste, and disinfect your tools and work surface afterwards. If you do not already have a box in the camper, get one before you start.

  • Thetford seal lube and conditioner

    A new seal lasts longer if it is kept conditioned. Thetford makes this for its own toilets, so it is the maintenance product matched to the part you are fitting.

These are supplies, not replacement parts. We have not matched them to your model, because they do not need to fit anything.

Check this before you order

  • Confirm the model is a Style II or a Residence.
  • Thetford lists the waste ball seal as its own number (42141) on the same parts list. We have not seen a contents list for this kit, so check the listing before buying a seal separately.

Before you start the job

Waste-contact work. Gloves, eye protection, and disinfect afterwards.

Everything documented for this appliance

Not the part you are holding?

Search by number, or check how to tell two similar-looking parts apart before you order.

Search by part numberWhy similar parts may not fit

Current marketplace inventory

Listings from eBay

We verified the part above from manufacturer documents. The listings below are current eBay inventory, and eBay sellers set their own titles, prices and shipping.

Checking current eBay inventory…

Camper Replacement Parts is not the seller. Price, shipping, stock and item condition are set by the eBay seller and can change at any time. We may earn a commission if you buy through these links.

Manufacturer
Thetford
OEM part number
42209
Part
Waste Ball Drive Arm Kit
Compatible models
Aqua-Magic Style II; Aqua-Magic Residence
Not compatible with
Aqua-Magic Style Plus
Status
Listed in the most recent parts documentation we hold
Commonly confused with
34090
Primary evidence
Thetford Parts List, Aqua-Magic Style II, Rev D; Thetford Parts List, Aqua-Magic Style Plus, Rev E; Thetford Parts List, Aqua-Magic Residence, Rev D
Last checked
2026-08-24

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Where our information comes from

We work from the manufacturer’s own documents. We have not installed this part ourselves, so everything here comes from the documentation rather than from a workshop.

Last checked 2026-08-24.