Hi all,
I just noticed that the white o-ring sealing the battery cap (precision gen2(?)) is broken.
I am unable to find a replacement available (EU) - only the full cap which is kinda expensive (10+€). Any hint /ideas where to find or an alternate which also fits?
Thanks and cheers!
For another device I found generic o rings on line for a much more reasonable price. Without Vernier Callipers to measure things up its a bit tricky to find the right size :-/
No ideas, but have the same issue on last battery change. Cheapest I’ve found is €15 with delivery for the battery cap. Which is still a lot for just the o ring!
Damn - maybe I’ll get into the weeds and try to estimate the size and shop for some generic ones. The original one is torn so I’ll get only a rough house number when I try to measure it anyway…
I got a reply from the 4iiii support: The dimensions are 1 x 17 mm. So I’ll look for a generic one in a hardware store.
ebay order gone in, although a couple of weeks delivery from Germany to Ireland.
Same, they gave me the dimensions and I bought a few generics. It’s been fine
I googled the supplier in the UK and the nice lady there just sent me one for free.
Hi
Can you share the Oring you find ?
At which store or online store you find it ?
HI Could you share where you bought the Oring ?
Thanks
I bought mine from ebay (Germany). There are still plenty sellers out there (search phrase: “oring 1 17”). Overseas I don’t now though - I guess you have to do the math to get the imperial units and order some different ones to test them 
Had the same issue. Found this thread. Followed instructions. Solved!
Thank you very much!
→ online-dichtungsshop O-Ring 17x1
2,50€ incl. shipping in Germany, arrived within two days
Fits perfectly!
Suitable replacement O-rings can be purchased on line from Ace Seal at https://www.aceseal.com for $0.25 plus shipping. I got 10 of 17 mm x 1 mm (with 70 density). I will give away five of them for free.
Contact me at ganfield@msn.com
any idea if these are the same size for stages? They dont seem to be responding to emails as of lately 
Just get an assortiment of o-rings from amazon. These are really cheap and handy to have around
Just ran into this page on my quest to find a new o-ring for my 4iiii precision power meter. The original white o-ring appears to be very brittle unfortunately.
Anyway, while searching for these o-rings I came across at least 2 types of material, being NBR and EPDM. NBR seems to be suitable for environments involving oil while EPDM is being used for weather resistant environments. I also found that Garmin recommends to only use EPDM rings when replacing.
Can anyone tell me if it’d be harmful to replace the original o-ring with an NBR one? EPDM seems to be much harder to find.
IIRC I bought NBR without much thinking and until now I had no problems at all.
