The Kochek NZ009 Firefighting and Irrigation Nozzle is a dual-gallonage nozzle that can adjust from a straight stream to a fog spray at 10 GPM before shooting up to increase flow rate to 24 GPM at optimal flow. Just rotate the black nozzle to increase or decrease your flow rate. The firefighting nozzle has a 1" NPSH thread and is made with high-quality lightweight aluminum, stainless steel, and rubber components. It is strong enough for firefighting and industrial applications and also can be used for high volume watering applications such as watering turf, infields, golf courses, and more. Note: NPSH threads can thread onto NPSH, GHT, or NPT connections.