Pete: That's great! You don't need to worry about an O-ring.
My Mistral Explosion 120 liter DOES have a vent plug....and I haven't looked inside to see if there's an O-ring or not.
My "STINGER" (nice hard Plastic) doesn't have a vent plug either... Maybe your Explosion was made in the same year as my "Stinger."
I like the word, "Stinger!"
Eric out. HapPPY New YeAR!!
My Mistral Explosion has a vent Plug...
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