... 2", 3/4" Glass bulb: 3mm, 5mm Sprinkler Head Standard or quick response Type: Pendent, upright Finish: ... ± 4 Thread: 1/2", 3/4"Sprinkler head is a key part of automatic water spraying system, mainly used ... the water towards the firing area. The sprinkler head can efficiently prevent and extinguish the fire at ... the start, it is widely used in the guesthouse,office,warehouse,clothing ...