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    Fittings for return line outlet, unthreaded 1-in pipe

    Hi, all! The return lines for my in-ground pool are unthreaded 1-in pipes. I am wondering what I can do to put any types of fittings onto these (like eyball vents, or perhaps even at some point a little spray fountain). Is there some type of fitting that can be wedged or tapped into the inside...