Concealed sprinkler Sprinkler head Fire system Product details 1.Material: brass and chrome plating 2.Temperature: 68with 5mm glass bulb 3.Thread: 1/2" 4.K= 80 5.Rated working pressure: 12 bars(1.2mpa) 6.Airproof test pressure: 24bars(2.4mpa) 7.Strength test pressure: 30bars(3mpa) 8. Weight: 140g more or less