5Z wrote:
I got my filling hose and gauge from an online scuba supplier as the
local gas house didn't want to sell such supplies to "the public" -
whatever that means.

Divers do a lot of transfilling and gas mixing for deep diving, etc.

-Tom

meaning that working with compressed gas is hazardous and they don't
want the liability exposure. I've worked around compressed gases for
years and part of OSHA mandatory safety training is required on an
annual basis.

As you are probably aware, there is lot of heat generated when filling
the cylinder. Hence the need for hydrostatic testing. The cylinder
self destructs if it fails the test.

I cringe every time I see a p/up truck with regulators on cylinders on
the road, instead of properly capped. I had the opportunity to see
what happens when a large O2 welding cylinder which was unsecure in the
bed of a truck, with no cap, fall off and knock the valve off.