I would go with the 1/2" tank, since it is a holding tank, and if it bursts or leaks, you'll really be sorry... better to be safe with a heavier wall tank. 1/2" is probably overkill, but you're talking about 12-15 gallons of sewage if the sucker leaks... your call...
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.