20mm Vertical Sidewall Fire Sprinkler and Sprinkler

20mm Vertical Sidewall Fire Sprinkler of Mintai fire fighting equipment.<1>. Sidewall Upstanding Sprinkler Material: brass or alloy zinc, up to your option<2>. Fire sprinkler head as one of essential fire fighting system equipment, G3/4' (20mm)  is available.<3>. Water sprinkler's working principle: Thermal expansion, fiberglass bulb automatically bursts when ambient temperature comes to 68 Celsius in fire hazard, then automatically put out a fire in a short time to fire fighting<4>. 79 and 93Celsius type also manufactured, its technical parameter as below