brass glass bulb fire sprinkler 1. FM and UL Certified 2. Brass Body, Chrome Plating 3. 1/2" , 3/4" with 68, 79, 93 degr Product name: automatic brass glass bulb fire sprinklerModel: ZSTY-20-68/79/93Connection thread: 3/4 inchDiameter: 20 mmFlow rate: 115 L/minResponse temperature: 68, 79, 93 Celsius temperature are available