For the last decade or so, refrigerant cans have
been required to have one way valves. You can
draw refrigerant out, but can't pump it back in.

Those old freon to air tank kits from the auto parts,
no longer work.

Christopher A. Young
Learn more about Jesus
www.lds.org
..

"Martin Eastburn" wrote in message
...
Refrig cans can be converted to small high pressure cans of air
that you charge up on the tank and tote it to the place you need it.

Not hard to do. They are rated for more pressure than you can pump in.

Martin