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The Bard 8603-010 constant flow valve is a 4 GPM, 3/4 inch flow control valve used on Bard water-source and geothermal HVAC applications to help maintain the correct water flow through the coaxial heat exchanger across a range of loop pressures. Maintaining the specified GPM helps protect performance and efficiency, supports stable leaving water temperatures, and can reduce nuisance issues tied to low or excessive flow. As a genuine Bard OEM component, 8603-010 is selected for proper fit and long-term compatibility with Bard packaged units; confirm the required rated flow for your specific model and configuration before ordering.