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UL 1821 Ed. 4-2019

Thermoplastic Sprinkler Pipe and Fittings for Fire Protection Service - Published Date: November 10, 2025

This new edition of ANSI/CAN/UL 1821 includes Canadian requirements for Combustible Piping for Sprinkler Systems, and requirements for Pipe and Fittings Embedded in Concrete.

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Underwriters Laboratories [ul]

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