I'm replacing my 2 gal. thermal expansion tank due to a pin hole leak.
I've charged the new one per the mfr's directions.

When I went to pull the old one off, it wouldn't budge.
I just used a wrench on the hex end of the pipe, and another wrench on the hex of the tank.
I'm afraid of using too much force and busting the pipe it hangs on.

Any tricks I might try?