The better pumps will turn liquid water into vapor, and draw
the vapor out. A dry system is essential to running
properly.

The HF air thing is better than no vacuum, but not any where
near as good as a real vacuum pump.

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


"JR North" wrote in message
...
The cheap Delavel-type compressed air powered pumps easily
pull 29".
HF has one for $10 or so.
JR
Dweller in the cellar