Wildcat air fill probe leak.


Harbor Freight has some variety packs you might get lucky with.

I learned early on from the community a few things when I got into PCP
-Order extra o-rings from a place like https://www.theoringstore.com/store/ (a few of all of them)
-Have a second fill probe also (they can get lost easy)
 
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Isn’t it metric? Generally can’t use a dash size O-ring in place of a metric. For example the -0xx series is about ten thousandths larger than an M1.5 and ten thousandths smaller than an M2.

If the proper size is a M1.5, you can get the nearest fit -00x and abrade it down with a drill and Dremel. Can get you up and running same day when there’s no local source of metrics.
 
Thank you all for your comments, I visited 3 different hardware stores and finally found one that carried o rings small enough to consider. Sadly some of them were mixed up, but I matched a few to my one good ring I had removed from probe. I believe the size was 7/32 x 11/32. anyway they fit and probe works like new. Thanks again for pointing me in the right direction.
Grump