brass body, chrome plating --style: pendent, upright, wallside, universal. --size: 1/2"(15mm), 3/4"(20mm). --certificate: UL. fire sprinkler glass bulb fire sprinkler fire sprinkler head1.Max. Ambient Temperature:38°C2.Sprinkler Rated Temperature:68°C3.The diameter of glass bulb: 5mm4.Rated working pressure:12 Bars(1.2Mpa)5.Airproof test pressure: 24 Bars(2.4Mpa)6.Strength test pressure:30Bars( ...