Verified Compatibility

Thetford 33312

Flush Tube

Thetford 33312 is the flush tube for the Aqua-Magic IV Hand Flush and Aqua-Magic IV Pedal Flush. The tube that carries water from the valve to the bowl rinse nozzle. Thetford lists it for Aqua-Magic IV Hand Flush and Aqua-Magic IV Pedal Flush. It is item 11 and 12 depending on the list.

Is it compatible?

Compatible with

  • Aqua-Magic IV Hand Flush
  • Aqua-Magic IV Pedal Flush

Not compatible with

  • Porta Potti 465 / 465 MSD
  • Porta Potti 155 / 155SL / 135 / 135 Marine
  • Porta Potti 345 / Campa Potti XG
  • Porta Potti 365 MSD / 365
  • Porta Potti 735 MSD / 735 Marine / 775 MSD

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

Current eBay listings for Thetford 33312

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Compatible models, and the document that says so

  • Aqua-Magic IV Hand Flush

    Verified against Thetford Parts List, Aqua-Magic IV Hand Flush (Rev. C).

    Item 11 on this parts list.

  • Aqua-Magic IV Pedal Flush

    Verified against Thetford Parts List, Aqua-Magic IV Pedal Flush (Rev. D).

    Item 12 on this parts list.

Not compatible with

Porta Potti 465 / 465 MSD. Thetford's Porta Potti 465 / 465 MSD parts list assigns 25808 to this position, not 33312.

Porta Potti 155 / 155SL / 135 / 135 Marine. Thetford's Porta Potti 155 / 155SL / 135 / 135 Marine parts list assigns 29311 to this position, not 33312.

Porta Potti 345 / Campa Potti XG. Thetford's Porta Potti 345 / Campa Potti XG parts list assigns 29311 to this position, not 33312.

Porta Potti 365 MSD / 365. Thetford's Porta Potti 365 MSD / 365 parts list assigns 29311 to this position, not 33312.

Porta Potti 735 MSD / 735 Marine / 775 MSD. Thetford's Porta Potti 735 MSD / 735 Marine / 775 MSD parts list assigns 29311 to this position, not 33312.

Commonly confused with this

33312 compared with the numbers it is confused with
33312this page2580829311
FitsAqua-Magic IV Hand Flush, Aqua-Magic IV Pedal Flush——
PartFlush Tube——
Interchangeable—NoNo
  • 25808. 25808 is the flush tube listed for Porta Potti 465 / 465 MSD. 33312 is listed for Aqua-Magic IV Hand Flush and Aqua-Magic IV Pedal Flush. They appear on separate Thetford parts lists.
  • 29311. 29311 is the flush tube listed for Porta Potti 155 / 155SL / 135 / 135 Marine, Porta Potti 345 / Campa Potti XG, Porta Potti 365 MSD / 365 and Porta Potti 735 MSD / 735 Marine / 775 MSD. 33312 is listed for Aqua-Magic IV Hand Flush and Aqua-Magic IV Pedal Flush. They appear on separate Thetford parts lists.
Superseded by, versus commonly confused withTwo rows. The top row shows 617748 with a solid arrow to 619068, labelled superseded: the manufacturer says to use the new number instead. The bottom row shows 42141 and 34120 side by side with a crossed link, labelled commonly confused: two different current parts that are not interchangeable.SUPERSEDED BY617748619068order this oneCOMMONLY CONFUSED WITH4214134120both current,neither replaces
Superseded by, versus commonly confused with

How to tell which one you have

Find item 11 or 12 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. 33312 is listed in Thetford Parts List, Aqua-Magic IV Hand Flush, Rev. C, which is the current parts documentation we hold for this 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.

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 IV Hand Flush or Aqua-Magic IV Pedal Flush.
  • If it is Porta Potti 465 / 465 MSD, order 25808 instead.
  • If it is Porta Potti 155 / 155SL / 135 / 135 Marine, Porta Potti 345 / Campa Potti XG, Porta Potti 365 MSD / 365 or Porta Potti 735 MSD / 735 Marine / 775 MSD, order 29311 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.

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.

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Manufacturer
Thetford
OEM part number
33312
Part
Flush Tube
Compatible models
Aqua-Magic IV Hand Flush; Aqua-Magic IV Pedal Flush
Not compatible with
Porta Potti 465 / 465 MSD; Porta Potti 155 / 155SL / 135 / 135 Marine; Porta Potti 345 / Campa Potti XG; Porta Potti 365 MSD / 365; Porta Potti 735 MSD / 735 Marine / 775 MSD
Status
Listed in the most recent parts documentation we hold
Commonly confused with
25808; 29311
Primary evidence
Thetford Parts List, Aqua-Magic IV Hand Flush, Rev. C; Thetford Parts List, Aqua-Magic IV Pedal Flush, Rev. D; Thetford Parts List, Porta Potti 465 / 465 MSD, Rev. D; Thetford Parts List, Porta Potti 155 / 155SL / 135 / 135 Marine, Rev. C; Thetford Parts List, Porta Potti 345 / Campa Potti XG, Rev. E; Thetford Parts List, Porta Potti 365 MSD / 365, Rev. D; Thetford Parts List, Porta Potti 735 MSD / 735 Marine / 775 MSD
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.