Another dumb question

[Kw9006nz]

(06-16-2021 )Chamberpains Wrote:  Your vacuum should hold 27ish-30 in/hg (depending how good the Guage is that your using) indefinitely. 30 min is just the least amount of time you want to leave it hold to check for leaks.

Quick ? For you what vac pump do you have? my pneumatic vac can only pull 20-26 depending on weather!