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See attached picture. I have a pipe that is inserted into an expanded pipe. Problem is, sometimes the expanded pipe slips down, spraying water everywhere. How would I go about keeping the expanded pipe held up? picture of pipes

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Both the pipe connections on the vertical pipe run in your picture (the one with the nut and the threaded one which is missing the nut) are designed as slip-joint connections. They utilize a rubber or plastic slip-joint washer that squeezes down on the inserted pipe when the slip-joint nut is tightened.

The assembly coming down from the sink is called a pop-up drain assembly and it has a 1 1/4" tailpiece pipe that you cannot see in your picture because it is inserted entirely into the 1 1/2" slip-joint extension which, by the way, is the piece that is missing its slip-joint nut).

You will need to get a couple parts from the plumbing shop: (1) 1 1/2" x 1 1/4" slip-joint nut; and (1) 1 1/2" x 1 1/4" slip-joint washer (rubber or plastic, don't matter)

Then you need to do exactly this:

  • remove the trap u-bend at the bottom
  • remove the 1 1/2" slip-joint extension and cut it down 1"
  • slide an 1 1/2" x 1 1/4" slip-joint nut up onto the 1 1/4" tailpiece, followed by an 1 1/2" x 1 1/4" slip joint washer
  • slide the (now 1" shorter) 1 1/2" slip-joint extension up onto the 1 1/4" tailpiece and hand tighten the nut and washer, from the previous step, to the threaded top of it
  • slide the trap u-bend back up into place
  • wiggle everything about until it's straight and clean
  • tighten all slip-joint nuts with a wrench, not too tight but more than hand-tight.

It should look something like this when you are done:

enter image description here

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