Fire Sprinkler Concealed 1. ISO and CCC certified 2. 1/2",3/4" ... . Brass, chrome plating 4. Quick delivery Fire Sprinkler ConcealedFeatures:ZSTD15(concealed type sprinkler): 57 degree, 68 degree, 79 degree,93 degree ... =working pressure)6) Large coverage glass bulb sprinkler Fire Sprinkler Concealed