Actually, it's 5 inches of mercury, and since 30

inches of Hg is approx 15

psi,

we'll call 5 inches approx 2.5 psi.

Bill Freeman

Thanks Bill. That correlates better with my estimate

of ten times the

displacement of an aircraft vacuum pump.

Paul Lamar

Hence you can spin it at 1/2 speed, save HP and increase
the Air Pump's life span X 2.......Yes!!?  :)

                                     Butch

 
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