Well, you currently have what looks like DVW (not pressure-rated) sweeps there. A Sch40 90 (not a spigot) is really what you need with a little extra Sch40 pipe to align.
EDIT: Woops, take that back - it is a schedule 40 (but its also a spigot).
I will need to replace the 90 deg. elbow -- I'm specifically asking what it is that is cemented into the elbow and mates with the black threaded union?
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