Are gas fittings tightened clockwise or anti-clockwise?

clockwise
anti-clockwise
it depends on the gas
there is no standard
Some gas fittings use reverse threads to prevent disastrous misconnections. For example, oxygen fittings are right-handed, but acetylene and other flammable gases use left-handed fittings.
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Answers by country

clockwise
anti-clockwise
it depends on the gas
there is no standard
answers
flagIndia
26%
43%
26%
4%
23
flagthe United Kingdom
38%
23%
23%
15%
13
flagPoland
24%
43%
22%
9%
3720
flagthe United States
30%
41%
20%
7%
39
flagRussia
16%
58%
16%
8%
12