Thetford 31708

Which models this fits

• 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.

What this does NOT fit

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

• 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. Thetford still lists 31708 on its current parts list. 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

  Thetford’s own kit instructions say to wear protective gloves and eyewear when you touch material that has been in contact with human waste, and to 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 a Aqua-Magic V or a Aqua-Magic VI.
• If it is a Aqua-Magic IV Hand Flush or a 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.

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 and we do not test parts in a shop.

• 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

• Thetford 33027: Blade Seal
• Thetford 34100: Water Valve with Drive Arm
• Thetford 42067: Pedal - White (High)
• Thetford 34122: Vacuum Breaker