The Cla-Val Model 790-63/790-67 Fire Hydrant Pressure Reducing Valve is a hydraulically operated, pilot actuated automatic control valve for pressure reducing service.  The main valve is made of 316L stainless steel with only one moving part, an elastomeric liner.  The valve has a female fire hose connection on the inlet side of the valve and male hose on the outlet side. The valve is available for 2 1/2″ or 4″ threaded end connections. In either size, the Cla-Val Fire Hydrant Pressure Reducing Valve will control pressure right down to shutoff.