Non-metallic rigid pipes and fittings, and non-metallic rigid couplings and joints that are made of polyvinylchloride (PVC) for municipal water, municipal sewers, agricultural irrigation, mining, or energy applications or systems, wherein the non-metallic rigid PVC pipes and fittings, and couplings and joints for energy applications or systems expressly excludes rigid PVC pipes and fittings, and couplings and joints for gas and natural gas transmission, and also expressly excludes rigid PVC pipes and fittings, and couplings and joints for repair or maintenance of gas and natural gas lines