Thetford 31708
Blade Seal
Thetford 31708 is the blade seal for the Aqua-Magic V and Aqua-Magic VI. The seal the blade closes against at the bottom of the bowl. Thetford lists it for Aqua-Magic V and Aqua-Magic VI. It is item 9 on those parts lists.
Is it compatible?
Compatible with
- Aqua-Magic V
- Aqua-Magic VI
Not compatible with
- Aqua-Magic IV Hand Flush
- Aqua-Magic IV Pedal Flush
Every model above is named in a manufacturer parts list, cited in full further down this page.
Current eBay listings for Thetford 31708
Search eBay for Thetford 31708eBay 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 V
Verified against Thetford Parts List, Aqua-Magic V (Rev. E).
Item 9 on this parts list.
Aqua-Magic VI
Verified against Thetford Parts List, Aqua-Magic VI (Rev. E).
Item 9 on this parts list.
Not compatible with
Aqua-Magic IV Hand Flush. Thetford's Aqua-Magic IV Hand Flush parts list assigns 33027 to this position, not 31708.
Aqua-Magic IV Pedal Flush. Thetford's Aqua-Magic IV Pedal Flush parts list assigns 33027 to this position, not 31708.
Commonly confused with this
| 31708this page | 33027 | |
|---|---|---|
| Fits | Aqua-Magic V, Aqua-Magic VI | Aqua-Magic IV Hand Flush, Aqua-Magic IV Pedal Flush |
| Part | Blade Seal | Blade Seal |
| Interchangeable | — | No |
- 33027. 33027 is the blade seal listed for Aqua-Magic IV Hand Flush and Aqua-Magic IV Pedal Flush. 31708 is listed for Aqua-Magic V and Aqua-Magic VI. They appear on separate Thetford parts lists.
How to tell which one you have
Find item 9 on your model’s parts diagram — that callout is this part. Check the model on the data plate reads Aqua-Magic V or Aqua-Magic VI.
Is this part still current?
Yes. 31708 is listed in Thetford Parts List, Aqua-Magic V, 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.
- 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 your toilet is Aqua-Magic V or Aqua-Magic VI.
- If it is Aqua-Magic IV Hand Flush or Aqua-Magic IV Pedal Flush, order 33027 instead.
- 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…
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
- 31708
- Part
- Blade Seal
- Compatible models
- Aqua-Magic V; Aqua-Magic VI
- Not compatible with
- Aqua-Magic IV Hand Flush; Aqua-Magic IV Pedal Flush
- Status
- Listed in the most recent parts documentation we hold
- Commonly confused with
- 33027
- Primary evidence
- Thetford Parts List, Aqua-Magic V, Rev. E; Thetford Parts List, Aqua-Magic VI, Rev. E; Thetford Parts List, Aqua-Magic IV Hand Flush, Rev. C; Thetford Parts List, Aqua-Magic IV Pedal Flush, Rev. D
- 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 V (Rev. E). Published by Thetford.
- Thetford Parts List, Aqua-Magic VI (Rev. E). Published by Thetford.
- Thetford Parts List, Aqua-Magic IV Hand Flush (Rev. C). Published by Thetford.
- Thetford Parts List, Aqua-Magic IV Pedal Flush (Rev. D). Published by Thetford.
Last checked 2026-08-29.
Related parts
Also fits the Aqua-Magic V
Thetford 31703: Seat and Cover Assembly - WhiteAlso fits the Aqua-Magic VI
Thetford 31856: Seat and Cover Assembly - WhiteAlso fits the Aqua-Magic V
Thetford 33226: Hand Spray Kit - WhiteOften confused with this
Thetford 33027: Blade Seal