A certain valve has a rating of 29"/hg. What is the P.S.I. Equiv. of
this? Was the valve rated
for vacuum and not pressure? Just need to know before I buy some of
these. If in fact the
valve was made for a vacuum system,will it function(on air) with the
equiv pressure(That I am
hoping one of you folks can tell me). I just need them for 20 lbs of
air pressure.

Thanx,

Mark