cleanouts - access to building drain, sewer or branch
cleanout plug / cap - pvc, abs, cast iron or brass is the removal part of a clean out pharrol. Most cast iron fittings use a brass plug (can be pounded off (normal) with out damage to iron fitting (not always). They are located in the front yard, in the wall, base of stack, in the floor. http://www.plumbingsupply.com/backflow.html .
coupling - fitting that is used to connect pipes
