Thetford 34120

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  This listing’s title says it fits the Style Plus and the Style II. Thetford’s own parts lists give the Style II a different seal, 42141. The part is right for a Style Plus. Do not use it for a Style II on the strength of that title.

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Compatible models, and the document that says so

• Aqua-Magic Style Plus

  Verified against Thetford Parts List, Aqua-Magic Style Plus (Rev E).

• Aqua-Magic Style Lite

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

Not compatible with

Aqua-Magic Style II. Thetford’s Style II parts list assigns 42141, not 34120. Retailer listings claiming both are not supported by Thetford’s documentation.

Commonly confused with this

• 42141. 42141 is the Style II and Residence seal. If your toilet is a Style II, 34120 is the wrong part.

How to tell which one you have

Check the model sticker. The Style Plus parts list also shows a shroud and shroud O-rings, which the Style II list does not, so a visible shroud around the base is a useful secondary clue.

Is this part still current?

Yes. 34120 is listed in Thetford Parts List, Aqua-Magic Style Plus, Rev E (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 sticker reads Style Plus.
• If it reads Style II or Residence, you need 42141 instead.

Before you start the job

Wear gloves and eye protection, and disinfect tools afterwards, as Thetford instructs for waste-contact work.

Everything documented for this appliance

• Aqua-Magic Style Lite — 5 part numbers
• Aqua-Magic Style Plus — 4 part numbers

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.

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.

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.

• Thetford Parts List, Aqua-Magic Style Plus (Rev E), dated 11/4/2025. Published by Thetford Corporation.
• Thetford Parts List, Aqua-Magic Style II (Rev D), dated 11/4/2025. Published by Thetford Corporation.
• Thetford Parts List, Aqua-Magic Style Lite (Rev D), dated 11/4/2025. Published by Thetford Corporation.

Last checked 2026-08-24.

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