I asked the company that manufactures them, they said they didn't know.

Does anyone know the sizes? I ask because the set is not available in the UK. Flying it over the Atlantic seems ridonkulous when I could just buy some o rings here.

  • Do you not have the old o-rings?
    – Batman
    May 27 '18 at 11:46
  • 3
    If you have the old rings, measure them. Or, better, take them to a shop and find a match. May 27 '18 at 12:21
  • 2
    I bought a cheap multipack of "various sizes" of O rings for about $4. It will probably be a standard size. Good luck!
    – Criggie
    May 27 '18 at 12:23
  • Unfortunately, i don't have the old one i need. It disintegrated and I threw it away before i thought to measure it
    – Ne Mo
    May 27 '18 at 12:26
  • 2
    I'd go with criggie's approach then. Maybe take the inflator tool to the hardware shop and compare with a few there.
    – Batman
    May 27 '18 at 12:36

Got mine from AliExpress 10X5X2.5mm O seal ring for US$2.

Tested it and it fix perfect.


Based on the photo in the question the big O ring is 12 mm outside to outside. The O ring rubber is 2 mm thick.

Googling tells me:

O-rings made from high quality buna-nitrile (BN70) rubber with a durometer rating of 70.


This is proportional to the inventory sticker being 12.0mm high as per all the ones I found in my house.

There appear to be two other sizes in the bag as well, one smaller and one thicker like a tap washer.

Own work

Given this bag of parts is $3.95 USD from several LBS and from Amazon its hardly worth messing about. If the freight is too much, ask for an envelope not a parcel or order more things to make it worthwhile.

  • Stressing that this is an estimate based on the photo, not a qualified measurement from a sample.
    – Criggie
    May 27 '18 at 12:47
  • Yeah it's more I don't want to rack up the air miles. Good skills with the image! :)
    – Ne Mo
    May 27 '18 at 17:10

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