The listing is to UL 1821, Thermoplastic Sprinkler Pipe and Fittings for Fire Protection Service It approves (with certain limitations) the use of flexible AquaPEX tubing and ProPEX expansion fittings ...
THE MULTIPURPOSE PEX RESIDENTIAL FIRE SPRINKLER SYSTEM incorporates sprinklers with the home's cold-water plumbing system, verifying fresh water is available to the sprinklers each time a cold-water ...
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