Which specification covers CPVC plastic pipe fittings, Schedule 80?

• A. ASTM B 88
• B. ASTM B 813
• C. ASTM F 437
• D. ASTM B 251

Answer: (C)

The specification for CPVC plastic pipe fittings, including Schedule 80, is ASTM F437. This standard is specifically for CPVC fittings used in pressure piping systems, covering configurations and dimensions that match CPVC pipe (including the heavier Schedule 80 wall thickness). Schedule 80 denotes a thicker wall and higher pressure rating than Schedule 40, so fittings must meet the same CPVC material and pressure requirements to ensure proper performance with hot-water or high-temperature service.

The other standards refer to different materials or components: copper tube standards cover copper piping, not CPVC fittings, and one standard listed covers CPVC pipe rather than fittings. That’s why they don’t apply to CPVC fittings, Schedule 80.