working pressure 175psig / 1.2Mpa ( 12 ) ; Factory Hydrostatic @ 500psig ( 3.4Mpa UL & listed EX6430 1 / 2 " NPT ( National National Pipe Thread ) thread sprinkler heads Nominal 5.6 K-Factor sprinkler heads , Dia5mm Glass Bulb Standard Response 155F 68C Automatic sprinklers of the frangible bulb type Underwriter Laboratories Listed , UL ( United States ) and ULC ( Canada ) Listed, Manufacturer: Watreketal
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