I have a 25# propane tank that I use from time to time. Had several with the
old styly valves that could not be refilled so I just rigged up a POL fitting
with a cross, with a schrader valve, a pressure gauge and a hose QD fitting.
Works great. Heavier than the freon bottles I have used in the past. Why
convert? Just couldn't see the perfectly good propane tanks go to waste and it
was not worth the expense to change the valve out to the new style