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Jim,
I would try a different hardware store. I don't know about your locale, but up here some hardware store carry a very complete line of ABS fittings, and the store down the street might only have three fittings.
Two reasons I would use ABS:
1. Rated for use down to -40 degrees
2. If it's visible from the outside, having white and black mixed might cause "questions" at some campgrounds. Like, it's a do-it-yourself repair, and is it adequate? Or will it break and leak stuff.
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