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Grabbed a handful of the 2.1" size before these disappear, and they seated on the coupler with no fuss at all. Rubber still felt pliable out of the bag, which matters when you're cramming it into a tight airframe groove.

Snug fit on my 2.5" coupler, no slop at all once seated. Only gripe is I wish they sold these in a bigger pack since they're getting discontinued. Grabbing a few more before they're gone.

These fit the 2.5" couplers snugly and seal well enough that I haven't had any separation issues on the last few flights. Only reason it's not five stars is the price per ring feels a bit steep for what's basically a piece of rubber. Still, I'll be grabbing a few spares before they disappear.