Brass glass bulb fire sprinkler 1. CCC and ISO Certified 2. Brass Body, Chrome Plating 3. 1/2", 3/4" with 68, 79, 93 degr Model: ZSTY-20-68/79/93 Connection thread: 3/4 inch Diameter: 20 mm Flow rate: 115 L/min Response temperature: 68, 79, 93 Celsius temperature are available. Shape Round Hardness 100 Pipe Wall Thickness according to the size Pull Strength 100 Yield (≥ MPa) according to the size Material Ductile Iron Type Welded Iron 100. Standard export packing.