Features: UL & CUL listed EX6430. 1/2 " NPT (National National Pipe Thread) American thread fire sprinkler heads Underwriter Laboratories Listed, UL(United States) and ULC(Canada) Listed Nominal 5.6 K-Factor fire sprinkler heads, Dia5mm Glass Bulb Standard Response 155F 68C Max working pressure 175psig /1.2Mpa(12 bar);Factory Hydrostatic Test @ 500psig (3.4Mpa) Automatic fire sprinklers of the frangible bulb type Specifications: Temperature Rating: 155°F (68°C) Discharge Coefficient: K=5.6(U.S) /80(Metric) Nominal Orifice Size:1/2"(15mm) Maximum Working Pressure:175psi(12bar) Min. Operating Pressure: 7psi (0.48bar) Factory Hydrostatic Test: 100%@ 500psi (34.5bar) Size: 4x7cm/1.57x2.76inches Package Includes: 1xFire Sprinkler note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.