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None! I recommend getting a hand pump with a gageHey guys, pumping newb here. I see you taking about pressure in Hg as a measurement. I have a basic ball squeeze pump. It only can get so much pressure before the ball will no longer inflatate again therefore it's basically the max pressure that can be had. I assume this is about the same for all hand ball pumps... Any guesses on how many Hg of pressure that would be?