-> The best by far is a unit off a central air conditioner. They're
-> quiet, fast and compact. Punch a hole into the top corner with your
-> air chisel
They really do work well Gerald, but I just use the normal low pressure
connection and put a foam packed filter canister over it.   Pumping
striaght UP to a surge tank where the oil can drain back down to the
compressor don't let as much of it get lost in the output air.
We've learned to be very careful with the overpressure valve on AC
units.  Those things have no conscience and will pump up to SEVERAL
hundred pounds altogether too quick.  We have a local tale we tell about
a guy named Jerry, who built what we now call a "Jerry Bomb" with a
refrigeration compressor and a water heater tank. He neglected to use a
RELIABLE pressure controller switch and launched his water heater
storage tank right through the roof of his shop!
We'd better not design a "Gerry Bomb" if we can avoid it. 
 ^..^
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