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Bob Engelhardt
 
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I use a 40# as an air pig - 20# is too small. Got it free at a refill
station, as it was not OPD.

Got the mercaptan stink out with a little bleach, swished around and
dumped out. I left the propane valve on and used a connector from a gas
grill, with a quick-disconnect on it. I use a male-male adapter to
fill. Put wheels and a long handle on it when it got tiresome carrying
back & forth for refills.

They have a working pressure of 240 psi.

Bob