How do I extract a snapped off PVC nipple?
My solution was not ideal; it might have been less work just to dig out the section of pipe. With that in mind, I followed the suggestion of another site to use a mini hacksaw similar to this one to cut several notches in the body of the nipple (stopping short of the threads). Then I gently pounded in the larger size nipple extractor with a small mallet and twisted. The nipple broke in half, and from there it was a simple matter to pull out the two pieces with a pair of pliers.