Thetford 31856
Seat and Cover Assembly - White
Thetford 31856 is the seat and cover assembly - white for the Aqua-Magic VI. The seat and lid, supplied together as one assembly. Thetford lists it for Aqua-Magic VI.
Is it compatible?
Compatible with
- Aqua-Magic VI
Not compatible with
- Porta Potti 345 / Campa Potti XG
- Aqua-Magic V
- Aria Classic
- Aria Deluxe
- Aria Deluxe III
- Aqua-Magic Style Lite
- 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 31856
Search eBay for Thetford 31856eBay 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 VI
Verified against Thetford Parts List, Aqua-Magic VI (Rev. E).
Not compatible with
Porta Potti 345 / Campa Potti XG. Thetford's Porta Potti 345 / Campa Potti XG parts list assigns 21317 to this position, not 31856.
Aqua-Magic V. Thetford's Aqua-Magic V parts list assigns 31703 to this position, not 31856.
Aria Classic. Thetford's Aria Classic parts list assigns 33384 to this position, not 31856.
Aria Deluxe. Thetford's Aria Deluxe parts list assigns 33384 to this position, not 31856.
Aria Deluxe III. Thetford's Aria Deluxe III parts list assigns 33384 to this position, not 31856.
Aqua-Magic Style Lite. Thetford's Aqua-Magic Style Lite parts list assigns 34144 to this position, not 31856.
Aqua-Magic Style Plus. Thetford's Aqua-Magic Style Plus parts list assigns 34144 to this position, not 31856.
Commonly confused with this
| 31856this page | 21317 | 31703 | 33384 | 34144 | |
|---|---|---|---|---|---|
| Fits | Aqua-Magic VI | — | Aqua-Magic V | Aria Classic, Aria Deluxe, Aria Deluxe III | Aqua-Magic Style Lite, Aqua-Magic Style Plus |
| Part | Seat and Cover Assembly - White | — | Seat and Cover Assembly - White | Seat and Cover Assembly - White | Seat and Cover Assembly - White |
| Interchangeable | — | No | No | No | No |
- 21317. 21317 is the seat and cover assembly (cp xg) listed for Porta Potti 345 / Campa Potti XG. 31856 is listed for Aqua-Magic VI. They appear on separate Thetford parts lists.
- 31703. 31703 is the seat and cover assembly - white listed for Aqua-Magic V. 31856 is listed for Aqua-Magic VI. They appear on separate Thetford parts lists.
- 33384. 33384 is the seat and cover assembly - white listed for Aria Classic, Aria Deluxe and Aria Deluxe III. 31856 is listed for Aqua-Magic VI. They appear on separate Thetford parts lists.
- 34144. 34144 is the seat and cover assembly - white listed for Aqua-Magic Style Lite and Aqua-Magic Style Plus. 31856 is listed for Aqua-Magic VI. They appear on separate Thetford parts lists.
How to tell which one you have
Check the model on the data plate reads Aqua-Magic VI. This is the white version; the colour is part of the number, not a finish option.
Is this part still current?
Yes. 31856 is listed in Thetford Parts List, Aqua-Magic VI, Rev. E, which is the current parts documentation we hold for this model. Earlier revisions of the Aqua-Magic Residence parts list carried this number. The current revision does not, so it is not claimed as a fit for that 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.
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 your toilet is Aqua-Magic VI.
- If it is Porta Potti 345 / Campa Potti XG, order 21317 instead.
- If it is Aqua-Magic V, order 31703 instead.
- If it is Aria Classic, Aria Deluxe or Aria Deluxe III, order 33384 instead.
- If it is Aqua-Magic Style Lite or Aqua-Magic Style Plus, order 34144 instead.
- Check you need white — the other colours are different part numbers.
- Ignore listing titles that claim one part covers several models unless the manufacturer's parts lists agree.
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.
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…
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- Manufacturer
- Thetford
- OEM part number
- 31856
- Part
- Seat and Cover Assembly - White
- Compatible models
- Aqua-Magic VI
- Not compatible with
- Porta Potti 345 / Campa Potti XG; Aqua-Magic V; Aria Classic; Aria Deluxe; Aria Deluxe III; Aqua-Magic Style Lite; Aqua-Magic Style Plus
- Status
- Listed in the most recent parts documentation we hold
- Commonly confused with
- 21317; 31703; 33384; 34144
- Primary evidence
- Thetford Parts List, Aqua-Magic VI, Rev. E; Thetford Parts List, Porta Potti 345 / Campa Potti XG, Rev. E; Thetford Parts List, Aqua-Magic V, Rev. E; Thetford Parts List, Aria Classic, Rev. E; Thetford Parts List, Aria Deluxe, Rev. C; Thetford Parts List, Aria Deluxe III, Rev. E; Thetford Parts List, Aqua-Magic Style Lite, Rev. D; Thetford Parts List, Aqua-Magic Style Plus
- Last checked
- 2026-08-29
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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.
- Thetford Parts List, Aqua-Magic VI (Rev. E). Published by Thetford.
- Thetford Parts List, Porta Potti 345 / Campa Potti XG (Rev. E). Published by Thetford.
- Thetford Parts List, Aqua-Magic V (Rev. E). Published by Thetford.
- Thetford Parts List, Aria Classic (Rev. E). Published by Thetford.
- Thetford Parts List, Aria Deluxe (Rev. C). Published by Thetford.
- Thetford Parts List, Aria Deluxe III (Rev. E). Published by Thetford.
- Thetford Parts List, Aqua-Magic Style Lite (Rev. D). Published by Thetford.
- Thetford Parts List, Aqua-Magic Style Plus. Published by Thetford.
Last checked 2026-08-29.
Related parts
Also fits the Aqua-Magic VI
Thetford 31708: Blade SealAlso fits the Aqua-Magic VI
Thetford 33226: Hand Spray Kit - WhiteOften confused with this
Thetford 31703: Seat and Cover Assembly - WhiteOften confused with this
Thetford 33384: Seat and Cover Assembly - White