I understand running threads to be 2 pieces of rigid threaded pipe joined by a coupler. Is this correct? If not, what are running threads?
Is a 3 piece union required any place 2 threaded ends of pipe meet?
Specifically, I was looking at the scrap pile and saw 2 threaded ends of 2" rigid each 4 feet long. I pieced them together with a coupler and used it for a service riser. I was proud of the fact I saved $50 for a stick of Rigid 2", but was wondering if those were indeed running threads, as prohibited by code.
PS, it should be noted that rigid pipe SUCKS!