A fun, super cheap project yields an awesome tool/toy to play with.

Can side tap: http://amzn.to/1NzRZbA You can salvage the same dual valve I use off of this side can tap
Line tap to recharge fridges/ac units: http://amzn.to/1ThGmdG

GREAT for science projects!


I've gotten this pump to pull to approx 15 microns, but easily does 25microns.

A theoretical perfect vacuum is 29.92inhg. You won't achieve this with any pump and need to adjust for your altitude. Every 1000 feet you are above sea level you need to subtract 1 inch of mercury. So I live at 4500 feet and that makes a perfect theoretical vacuum for me 25.42inhg(29.92 minus 4.5). The barometric pressure plays a role as well by it is negligible.

This link has a good calculator: https://www.turntex.com/component/con...

Water boiling point to vacuum: http://www.engineersedge.com/h2o_boil...