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I don't think there is a check valve..... I'll check tomorrow when i get home.

Whoops, i made a typo... I meant to say 27 psi with the tank empty.

4 years a go i replaced my 1/2 hp shallow well ( 65 feet ) pump with a 3/4 hp ( it was only thing available on a Sunday evening.. I also replaced my expansion tank at the same time. Recently my bladder ruptured so i replaced the tank AND switch. New tank is a 44 gallon switch is a 30/60. My...