Originally Posted By: LesSnyder
comment about the GAZ cylinders... used to use the little hand grenades with the Bunsen burner top... one day a student in a next door class unscrewed the burner and popped the legs off... the next door teacher brought the cylinder into my room spewing butane... luckily I was able to put it in my spark proof vent hood to clear the room... we immediately switched to units with a sealing Schrader valve


You mean those 190gram puncture style canisters? Well I noticed that they have a flapper valve added to them on the inside. (often marked quite clearly on the outside) Too many accidents with those canisters. Now we have a valveless puncture canister with valve.... Also made them more expensive.
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