Thetford 16833
Vacuum Breaker
Thetford 16833 is the vacuum breaker for the Cassette C200S-CS and Cassette C223CS and Cassette C223S and Cassette C224CW and Cassette C402C / C403L. The anti-siphon device on the water supply that stops water being drawn back out of the toilet into the fresh water line. Thetford lists it for Cassette C200S-CS, Cassette C223CS, Cassette C223S, Cassette C224CW and Cassette C402C / C403L. It is item 1 and 2 and 3 and 5 depending on the list.
Is it compatible?
Compatible with
- Cassette C200S-CS
- Cassette C223CS
- Cassette C223S
- Cassette C224CW
- Cassette C402C / C403L
Not compatible with
- Aqua-Magic Residence
- Aqua-Magic Style II
- 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 16833
Search eBay for Thetford 16833eBay 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
Cassette C200S-CS
Verified against Thetford Parts List, Cassette C200S-CS (Rev. D).
Item 1 on this parts list.
Cassette C223CS
Verified against Thetford Parts List, Cassette C223CS (Rev. D).
Item 2 on this parts list.
Cassette C223S
Verified against Thetford Parts List, Cassette C223S (Rev. D).
Item 2 on this parts list.
Cassette C224CW
Verified against Thetford Parts List, Cassette C224CW (Rev. E).
Item 3 on this parts list.
Cassette C402C / C403L
Verified against Thetford Parts List, Cassette C402C / C403L (Rev. D).
Item 5 on this parts list.
Not compatible with
Aqua-Magic Residence. Thetford's Aqua-Magic Residence parts list assigns 34122 to this position, not 16833.
Aqua-Magic Style II. Thetford's Aqua-Magic Style II parts list assigns 34122 to this position, not 16833.
Aqua-Magic Style Lite. Thetford's Aqua-Magic Style Lite parts list assigns 34122 to this position, not 16833.
Aqua-Magic Style Plus. Thetford's Aqua-Magic Style Plus parts list assigns 34122 to this position, not 16833.
Commonly confused with this
| 16833this page | 34122 | |
|---|---|---|
| Fits | Cassette C200S-CS, Cassette C223CS, Cassette C223S, Cassette C224CW, Cassette C402C / C403L | Aqua-Magic Residence, Aqua-Magic Style II, Aqua-Magic Style Lite, Aqua-Magic Style Plus |
| Part | Vacuum Breaker | Vacuum Breaker |
| Interchangeable | — | No |
- 34122. 34122 is the vacuum breaker listed for Aqua-Magic Residence, Aqua-Magic Style II, Aqua-Magic Style Lite and Aqua-Magic Style Plus. 16833 is listed for Cassette C200S-CS, Cassette C223CS, Cassette C223S, Cassette C224CW and Cassette C402C / C403L. They appear on separate Thetford parts lists.
How to tell which one you have
Find item 1 or 2 or 3 or 5 on your model’s parts diagram — that callout is this part. Check the model on the data plate reads Cassette C200S-CS, Cassette C223CS, Cassette C223S, Cassette C224CW or Cassette C402C / C403L.
Is this part still current?
Yes. 16833 is listed in Thetford Parts List, Cassette C200S-CS, Rev. D, which is the current parts documentation we hold for this model.
Also worth having 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 Cassette C200S-CS, Cassette C223CS, Cassette C223S, Cassette C224CW or Cassette C402C / C403L.
- If it is Aqua-Magic Residence, Aqua-Magic Style II, Aqua-Magic Style Lite or Aqua-Magic Style Plus, order 34122 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…
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- Manufacturer
- Thetford
- OEM part number
- 16833
- Part
- Vacuum Breaker
- Compatible models
- Cassette C200S-CS; Cassette C223CS; Cassette C223S; Cassette C224CW; Cassette C402C / C403L
- Not compatible with
- Aqua-Magic Residence; Aqua-Magic Style II; Aqua-Magic Style Lite; Aqua-Magic Style Plus
- Status
- Listed in the most recent parts documentation we hold
- Commonly confused with
- 34122
- Primary evidence
- Thetford Parts List, Cassette C200S-CS, Rev. D; Thetford Parts List, Cassette C223CS, Rev. D; Thetford Parts List, Cassette C223S, Rev. D; Thetford Parts List, Cassette C224CW, Rev. E; Thetford Parts List, Cassette C402C / C403L, Rev. D; Thetford Parts List, Aqua-Magic Residence, Rev. D; Thetford Parts List, Aqua-Magic Style II; 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, Cassette C200S-CS (Rev. D). Published by Thetford.
- Thetford Parts List, Cassette C223CS (Rev. D). Published by Thetford.
- Thetford Parts List, Cassette C223S (Rev. D). Published by Thetford.
- Thetford Parts List, Cassette C224CW (Rev. E). Published by Thetford.
- Thetford Parts List, Cassette C402C / C403L (Rev. D). Published by Thetford.
- Thetford Parts List, Aqua-Magic Residence (Rev. D). Published by Thetford.
- Thetford Parts List, Aqua-Magic Style II. 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 Cassette C200S-CS
Thetford 23709: Electric Valve, Hose Nut, and Hose BarbAlso fits the Cassette C200S-CS
Thetford 23721: Lip Seal (Post-6/15/00)Often confused with this
Thetford 34122: Vacuum BreakerAnother Thetford part
Thetford 07101: Lip Seal