I just read the other day on here that OSHA made a law against that because they felt it was putting a valve on a safety device much like putting a valve on say a pressure relief valve on a boiler... Not that anyone can manually close a schrader core.
Originally Posted by timebuilder
I am yet to see any proof of this.
I treat every pressure switch as if it doesn't have a core behind it. Loosen it and give it the wiggle test as you slowly unscrew it, if it doesn't stop leaking by the time you get down to the last two threads you know you are screwed.
10mm, because it's better than .45acp