National Electrical Manufacturers Association published NEMA Polyvinyl Chloride (PVC) Fittings for Use with Rigid PVC Conduit and Tubing, which includes requirements for materials, workmanship, dimensions, physical properties, couplings, female adaptors, male terminals, junction box adapters, reducers, elbows, caps, and end-bells. This standard also provides methods for marking and inspection as well as practices for indicating compliance with these standards.