fire sprinkler heads glass bulb fire sprinkler 1.Size:1/2", 3/4" 2.Material:brass or zinic. 3.Small sample order is ok fire sprinkler heads1.Thread: 1/2", 3/4"2.Flux coefficient K: 80, 1153.Install type:upright,pendent,sidewall.4.Material:brass or zinic alloyWe also supply other type of fire sprinkler for you. fire sprinkler heads