Chapter 6 — WATER SUPPLY AND DISTRIBUTION
605.11 Polypropylene (PP) Piping and Joints — 2025 California Plumbing Code
California Plumbing Code (Title 24, Part 5) · 2025 edition · updated 2026-10-19 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Plumbing Code (Title 24, Part 5) § 605.11 · Effective January 1, 2026 · Official source: Building Standards Commission
PP pipe and fittings shall be installed in accordance with the manufacturer’s installation instructions and shall comply with Section 605.11.1 through Section 605.11.3. 605.11.1 Heat-Fusion Joints. Heat-fusion joints for polypropylene (PP) pipe and fitting joints shall be installed with socket-type heat-fused polypropylene fittings, fusion outlets, butt-fusion polypropylene fittings or pipe, or electro-fusion polypropylene fittings. Joint surfaces shall be clean and free from moisture. The joint shall be undisturbed until cool. Joints shall be made in
accordance with ASTM F2389 or CSA B137.11.
605.11.2 Mechanical and Compression Sleeve Joints. Mechanical and compression sleeve joints shall
be installed in accordance with the manufacturer’s instal lation instructions.
605.11.3 Threaded Joints. PP pipe shall not be threaded. PP transition fittings for connection to other piping materials shall only be threaded by use of copper alloy or stainless steel inserts molded in the fitting.
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