Automatic pressure control with a flow capacity of 70-200 gpm (260-760 l/min). Includes patented twist slide-type valve for turbulence-free flow control, flush without shutting down and is lightweight hard coat anodized aluminum for maximum resistance to corrosion and wear. 1.5" NH (38mm) rigid rocker lug coupling is standard. May be used with a separate valve or playpipe. Ideal for break-and-extend operations. 1.5" NH (38mm) rigid rocker lug coupling is standard. FM Approved