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The FlowCal valve from Caleffi automatically maintains the flow rate to each terminal unit regardless of differential pressure changes across the circuits. FlowCal has an exclusive flow cartridge made of a scale-resistant, low-noise polymer and a compact, low-lead brass valve body. The valve has union end connections for easier installation and maintenance. There are 16 flow rates available ranging from 1/2 to 10 gpm and connection sizes range are 1/2”, 3/4” and 1” in NPT and sweat connections, as well as 3/4” press connections. Caleffi