The NIBCO 1709 Series variable orifice manual balancing valve is dezincification-resistant and complete with integral pressure temperature ports and memory stop. The 1709 is an economical option for applications where standard size valves won''''t fit.The 1709 is also capable of providing system isolation for maintenance. The integral memory stop feature allows the system to be returned to its retained settings once maintenance is completed. NIBCO manual balancing valves provide the ultimate solution for a wide range of mechanical and HVAC chilled and hot water application requirements to ensure