Summary

Note: I updated this shortly after posting as the wall was too thin at the undercut area. Also added a hex recess for a nut.

Inspired by a similar part, and having a need for a larger part for a damaged nut on my hot tub, I submit this, a 2 1/2" split nut for the PVC piping. Thread has a pitch of .125" (1/8"). Thru ID is Ø2.75", undercut is Ø2.9" and the crests (major diameter) of the mating thread are around Ø3.06".