Week 22, Day 2: Plumbing terminology

Deep into plumbing terminology. Look for illustrations of terms in the NPC Appendix. Lots of good illustrations online

For example: Air admittance valve; old style mechanical types only permitted on RVs.

New style diaphragm that are permitted by NPC

What happens if you accidentally glue up a $17.80 4'ABS DWV "y" fitting? Make a trip back to town for another fitting?