Thanks to all you guys that took the time to post your setups! Mine is just like JTCHVAC, except I need to put a blank off valve on the pump. I do however wonder about the tightness of all the CRT's and blank off valve. I know I had a cheaper CRT once that I originally bought to change bad cores on pressurerised systems that I know would not hold a 500 micron vacuum. let alone 300 which I really like to pull to. May try AIRESEARCH idea without CRT, but where do you put micron gauge (I guess a tee in line but another leak point?)