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Discussion Starter · #1 ·
I know why propane tanks and fittings are reverse thread but I can't for the life of me figure out why most propane regulators turn the opposite way. This would seem to actually be a safety issue - you know - someone quickly trying to turn the propane down and then having it blast?

Anyone in the know have an idea of why they do this?

BTW: I'm talking about the adjustable regulator knob not any of the fittings.
 

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Discussion Starter · #3 ·
I believe it's so people don't accidentally hook up a gas connection to something bad, like maybe a water or oxygen connection or vice versa.

Anyway, that's what I was told when I asked, a long time ago. You know, before the internet.

https://answers.yahoo.com/question/index?qid=20120201141500AAkjM46
Actually, my questions was as it relates to the adjusting knob not the tank thread. I got a reply privately and the reasoning behind it was the mechanics of how a regulator works and what the adjusting screw does. If they had uses a reverse threaded screw internally to the regulator that would have allowed "expected" operation rather than the reverse thread we notice on most of the units.
 
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