the threads do not seal, the O-ring does the sealing, i have purchased 4 of that type canister from BRS and have found that there are 2 different threads, they are very close but you can't get them to seal if they don't match.
also i have had to tighten them with the wrench sometimes, they are very strong so don,t be afraid to crank on them a bit
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Crap happens, that's why they sell toilet paper in 48 roll packs!
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