Verified Compatibility

Thetford 16175

Lip Seal (Pre-6/15/00)

Thetford 16175 is the lip seal (pre-6/15/00) for the Cassette C2 and Cassette C4. The seal that sits around the lip of the flush ball or blade opening. Thetford lists it for Cassette C2 and Cassette C4.

Is it compatible?

Compatible with

  • Cassette C2
  • Cassette C4

Every model above is named in a manufacturer parts list, cited in full further down this page.

Current eBay listings for Thetford 16175

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eBay 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 C2

    Verified against Thetford Parts List, Cassette C2 (Rev. D).

  • Cassette C4

    Verified against Thetford Parts List, Cassette C4 (Rev. D).

How to tell which one you have

Check the model on the data plate reads Cassette C2 or Cassette C4.

Is this part still current?

Thetford marks this part as limited availability.

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 Cassette C2 or Cassette C4.
  • 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.

Search by part numberWhy similar parts may not fit

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
16175
Part
Lip Seal (Pre-6/15/00)
Compatible models
Cassette C2; Cassette C4
Status
Limited availability
Primary evidence
Thetford Parts List, Cassette C2, Rev. D; Thetford Parts List, Cassette C4, 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.

Last checked 2026-08-29.