How do you add air to an old steel expansion tank? The expansion tank doesn't not have an area where I can read the pressure but I do have a compressor and I can add air to it.
I drained water from it today and i opened one of the plugs but it doesn't seem to suck air rather than push it out. Was weird. Perhaps it's an old junk. Thanks for your help
Here is a similar old steel tank I have. ![]()
I have one of these guys:
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I have one of these guys:
