Thetford 31703

Which models this fits

• Aqua-Magic V

  Verified against Thetford Parts List, Aqua-Magic V (Rev. E).

What this does NOT fit

Porta Potti345.Campa Potti XG. Thetford's Porta Potti345.Campa Potti XG parts list assigns 21317 to this position, not 31703.

Porta Potti345Campa Potti XG. Thetford's Porta Potti345Campa Potti XG parts list assigns 21317 to this position, not 31703.

Aqua-Magic VI. Thetford's Aqua-Magic VI parts list assigns 31856 to this position, not 31703.

Aria Classic. Thetford's Aria Classic parts list assigns 33384 to this position, not 31703.

Aria Deluxe. Thetford's Aria Deluxe parts list assigns 33384 to this position, not 31703.

Aria Deluxe III. Thetford's Aria Deluxe III parts list assigns 33384 to this position, not 31703.

Aqua-Magic Style Lite. Thetford's Aqua-Magic Style Lite parts list assigns 34144 to this position, not 31703.

Aqua-Magic Style Plus. Thetford's Aqua-Magic Style Plus parts list assigns 34144 to this position, not 31703.

Commonly confused with this

• 21317

  21317 is the seat and cover assembly (cp xg) listed for Porta Potti345.Campa Potti XG and Porta Potti345Campa Potti XG. 31703 is listed for Aqua-Magic V. They appear on separate Thetford parts lists.

• 31856

  31856 is the seat and cover assembly - white listed for Aqua-Magic VI. 31703 is listed for Aqua-Magic V. They appear on separate Thetford parts lists.

• 33384

  33384 is the seat and cover assembly - white listed for Aria Classic, Aria Deluxe and Aria Deluxe III. 31703 is listed for Aqua-Magic V. They appear on separate Thetford parts lists.

• 34144

  34144 is the seat and cover assembly - white listed for Aqua-Magic Style Lite and Aqua-Magic Style Plus. 31703 is listed for Aqua-Magic V. They appear on separate Thetford parts lists.

How to tell which one you have

Check the model on the data plate reads Aqua-Magic V. This is the white version; the colour is part of the number, not a finish option.

Is this part still current?

Thetford marks this part as limited availability.

Check this before you order

• Confirm your toilet is a Aqua-Magic V.
• If it is a Porta Potti345.Campa Potti XG or a Porta Potti345Campa Potti XG, order 21317 instead.
• If it is a Aqua-Magic VI, order 31856 instead.
• If it is a Aria Classic, Aria Deluxe or a Aria Deluxe III, order 33384 instead.
• If it is a Aqua-Magic Style Lite or a Aqua-Magic Style Plus, order 34144 instead.
• Check you need white — the other colours are different part numbers.
• 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, Porta Potti345.Campa Potti XG. Published by Thetford.
• Thetford Parts List, Porta Potti345Campa Potti XG (Rev. E). Published by Thetford.
• Thetford Parts List, Aqua-Magic VI (Rev. E). Published by Thetford.
• Thetford Parts List, Aria Classic (Rev. E). Published by Thetford.
• Thetford Parts List, Aria Deluxe (Rev. C). Published by Thetford.
• Thetford Parts List, Aria Deluxe III (Rev. E). 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

• Thetford 34106: Pedal Cable Kit
• Thetford 33312: Flush Tube
• Thetford 34144: Seat and Cover Assembly - White
• Thetford 70400: Nozzle Assembly With Cap