WWT871111 (Watts) | 2 1/2 Pressure Reducing Control Valve With Low-Flow Bypass Feature | ThreadThis 2 1 2 IN Watts Pressure Reducing Control Valve With Low Flow By Pass, Model 115 74, is Designed to Automatically Reduce a Fluctuating Higher Inlet Pressure to a Constant Lower Downstream Pressure Regardless of Varying Flow Rates. A Flow Rate Below The Normal Range of The Main Line Pressure Reducing Control Valve is Handled by a Separate, Valve Mounted, Direct Acting Low Flow By Pass Pressure Reducing Valve. It Has Threaded Connections. Watts