... Thread: 1/2", 3/4" Glass bulb: 3mm, 5mm Upright Fire Sprinkler Standard or quick response Type: Pendent, upright Finish: Natural brass ... 3/4"Sprinkler head is a key part of automatic water spraying system, mainly used for fire detection and extinguishing the fire. When the ... the fire at the start, it is widely used in the guesthouse,office,warehouse,clothing factory,cinema etc. ZSTZ-15 Fire Sprinkler