Can someone tell me what this head is? It is an SSU, brass, SR, fusible link, 3/4 pipe marked A584 on the deflector and marked MHX on the frame. There is no paint on the arms. But I could have removed the frame paint when I removed the green paint. I vaguely remember that as a Grinnell number. What is the K factor? I assume because the frame is not painted the temp rating is 155°F. The 3/4 pipe means it is an Extra Large Orifice?
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