[DangeloInspections]

Right on V.T....! I just replaced mine the other day. Typically these will last 6-10 years. It is an easy DIY job.

To tell if you need to replace this you can gently tap on the side of it. You should hear a difference in sound as you go up.....there is a rubber bladder inside and kept a "pillow" of air to compensate for varying pressures within your domestic water system. Thus the difference in sound.

If you hear no sound difference, or if water comes out the Schrader valve when checking it, your tank bladder has compromised and the tank should be replaced.

On a side note, if you have not replaced this expansion tank in years and you find yourself paying a plumber to replace an old water tank, you might as well have them do both when you have them there.

Frank D.