Daniel, I tried to investigate this a little bit but didn't find any solid answers. I believe the pintle on the deflector signifies that the sprinkler’s K-factor is not standard for the thread size. Is that a ½” NPT head? The 11.4 may be the exact k-factor while the data sheet lists the 11.2K nominal k-factor since NFPA 13 allows the actual outlet to be anywhere from 10.7k-11.7k. Maybe Gem just wanted to be very clear on the exact k-factor for calculations, especially if it is a non-standard thread size.
Hope this helps! Eric Rieve, SET Rieve Fire Protection
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