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Bard part number 8603-008 is an OEM constant flow valve used on select Bard water source heat pump applications to regulate the water circuit at a fixed 8 GPM flow rate with 3/4 inch connections, helping maintain proper heat transfer even when building water pressure changes. This valve is a direct-fit mechanical flow regulating component intended to restore correct unit water flow and stable performance after a worn or sticking valve causes low flow, nuisance lockouts, or inconsistent capacity, and it is commonly referenced for use with the Bard WPV60C platform. Confirm compatibility by matching your unit model and the required GPM rating before ordering.