Thetford 33027
Blade Seal
Thetford 33027 is the blade seal for the Aqua-Magic IV Hand Flush and Aqua-Magic IV Pedal Flush. The seal the blade closes against at the bottom of the bowl. Thetford lists it for Aqua-Magic IV Hand Flush and Aqua-Magic IV Pedal Flush. It is item 8 and 9 depending on the list.
Which models this fits
Aqua-Magic IV Hand Flush
Verified against Thetford Parts List, Aqua-Magic IV Hand Flush (Rev. C).
Item 8 on this parts list.
Aqua-Magic IV Pedal Flush
Verified against Thetford Parts List, Aqua-Magic IV Pedal Flush (Rev. D).
Item 9 on this parts list.
What this does NOT fit
Aqua-Magic V. Thetford's Aqua-Magic V parts list assigns 31708 to this position, not 33027.
Aqua-Magic VI. Thetford's Aqua-Magic VI parts list assigns 31708 to this position, not 33027.
Commonly confused with this
31708 is the blade seal listed for Aqua-Magic V and Aqua-Magic VI. 33027 is listed for Aqua-Magic IV Hand Flush and Aqua-Magic IV Pedal Flush. They appear on separate Thetford parts lists.
How to tell which one you have
Find item 8 or 9 on your model’s parts diagram — that callout is this part. Check the model on the data plate reads Aqua-Magic IV Hand Flush or Aqua-Magic IV Pedal Flush.
Is this part still current?
Yes. Thetford still lists 33027 on its current parts list.
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 IV Hand Flush or a Aqua-Magic IV Pedal Flush.
- If it is a Aqua-Magic V or a Aqua-Magic VI, order 31708 instead.
- Ignore listing titles that claim one part covers several models unless the manufacturer's parts lists agree.
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.
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 IV Hand Flush (Rev. C). Published by Thetford.
- Thetford Parts List, Aqua-Magic IV Pedal Flush (Rev. D). Published by Thetford.
- Thetford Parts List, Aqua-Magic V (Rev. E). Published by Thetford.
- Thetford Parts List, Aqua-Magic VI (Rev. E). Published by Thetford.
Last checked 2026-08-29.