>  I tried WD-40 to dislodge and
>unstuck the large, comma-shaped, old valve, but to no avail.     The tank,
>whose radius measures about 26 ½” and its height 36”, also has a drainage
>pipe at the bottom, as well.

    Try "Liquid Wrench" (available in small cans) and then tap with a
hammer to set up a vibration.  I managed to unfreeze the pistons in
an old car engine that way.

                                                        Adrian
--
Adrian M. Wenner                (805) 963-8508 (home office phone)
967 Garcia Road                 [log in to unmask]
Santa Barbara, CA  93103        www.beesource.com/pov/wenner/index.htm

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*
*    "We not only believe what we see:
*  to some extent we see what we believe."
*
*                           Richard Gregory (1970)
*
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