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Bad News: I now need to find out where I can get rid of 5 gallons of battery-acid/water solution and start a new fresh acid bath.
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I'm just guessing, but suspect that you should start by neutralizing the acid w/ baking soda or equivalent. What's left may be safe to dispose of w/o to much trauma. I know that sulfur isn't that nasty, and neither is zinc.
One of the websites mentioned above in the 'how to annodize' post suggested NAPA as a good source for battery acid. Another was an EPA site w/ lots of pointers to stuff that would presumably tell you how to get rid of the solutions "properly".
The NPT fittings do sound like the best approach to connecting your parts, probably far easier than the other alternative, namely firing up the MIG welder...
Gooserider