1.1 This specification establishes requirements for polypropylene (PP) piping system components made to metric sizes and IPS schedule 80 sizes, and pressure rated for water service and distribution supply (see Appendix X1). Included are cri This specification establishes the requirements for polypropylene (PP) piping system components such as pipe, fittings, valves, and manifolds used in water service lines, hot-and-cold water distribution, hydronic heating, and irrigation systems to tran