The Watts 0856740 1-inch Flow Measurement Valve is a durable bronze-body valve designed to measure and regulate water flow in HVAC hydronic systems. It uses integrated metering ports and pressure taps to help technicians determine flow rates and adjust water distribution for optimal performance. This valve is suitable for fan coil units, water-source heat pumps, reheat coils, unit hea... https://www.partshnc.com/0856740-watts-1-flow-measurement-valve-csm-61-m1-t