Robert M. Gary wrote:
Because medical O2 vendors never "fill" bottles. They simply exchange.

Speak for yourself.

The medial O2 vendor that I use never hand a problem doing a fill on my
tank. Its an E sized bottle and he just mixes it in with the rest of that
tanks he fills that day.

The downside is that he has to have it over night. The upside of the
downside is that he will deliver it to my place of work the next day free
of charge.

If anybody in the Columbia River Gorge area needs a tank filled, I'm using
Mid-Columbia Medical Equipment in The Dalles.

--
Frank Stutzman
Bonanza N494B "Hula Girl"
Hood River, OR