Also, the typical lifetime of an expansion tank is 5 to 7 years, then they need to be replaced. The simple test to see if the tank is still good is tap the side of the tank, above the weld it should ring (like a bell) below the tank it will sound dull, if the whole tank sounds dull, the bladder has failed and the tank needs to be replaced.
NOTE: Lowes (and probably others) sell at least 2 versions one for wells and one for public water service, be sure to get the one for public water service, the one for wells has a lower pressure rating.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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