... /2", 3/4" Glass bulb: 3mm, 5mm Upright Fire Sprinkler Standard or quick response Type: Pendent, upright Finish: Natural brass ... : K=80± 4 Thread: 1/2", 3/4"Sprinkler head is a key part of automatic water spraying system ... start spraying the water towards the firing area. The sprinkler head can efficiently prevent and extinguish the fire at ... ,warehouse,clothing factory,cinema etc. ZSTZ-15 Fire Sprinkler