2012 IPC: 303.1 Identification. Each length of pipe and each
pipe fi tting, trap, fi xture, material, and device utilized in a plumbing
system shall bear the identification of the manufacturer and any markings required by the applicable referenced standards.
303.4 Third-Party Testing and Certification. All plumbing products
and materials shall be listed by a third-party certification agency
as complying with the referenced standards. Products and
materials shall be identifi ed in accordance with Section*303.1.