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Through some trial and error, I was able to finally figure out which size O-rings would work to seal the Umarex 2x CO2 adapter. I bought these from the O-Ring store... they are very nice, knowlegeable and helpful. But, unfortunately, the only polyurethane O-ring they had of the three was the one...

Thanks much, all good points. Interesting stuff. It would be great if all designers always considered these things, but what are you going to do? Adapt. Hopefully this will be helpful to others. Yes probably an 8.5mm x 1.5 then... and what you said before, the one I probably put in was the...

Good point... I'll call or write them and ask for a parts diagram. Meanwhile hopefully someone recognizes the original seal... I did a giant search for urethane airgun seals, and scrolled through hundreds. None even have the "step" design in this adapter. But I searched for "with step"...

I have the Umarex 2 Co2 cartridge adapter, which is used to replace the single 88 gram Co2 tank in various air guns. It fits many makes and models, but I use mine on my .22 Umarex 850. My issue is that, after piercing the Co2 carts, the seal around the piercing shaft leaks. I can back off the...