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"If there be any among us who [disagree], let them stand undisturbed as monuments of the safety with which error of opinion may be tolerated, where reason is left free to combat it." Thomas Jefferson, March 4, 1801
Telescoping fitting. This fitting glues into a 1.25" Fitting (like a couple) and allows 3/4" Sch 40 sized pipe (1.05" OD) to slide into the 1.25" pipe. If you use a fitting like a couple, the other side of the couple will take the 1.25" pipe. If you want to stabilize the two pieces of pipe you'll want one on either and and/or one on the end and one in the middle depending on your application. If you do this you'll need to round off or chamfer (bevel cut) the end of the 3/4" pipe so it goes smoothly into the sleeve.
You can also use these in a Tee fitting for some interesting projects. See this video.