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Bard part 8603-019 is an OEM constant flow valve rated for 3 GPM with a 3/4 inch connection, used in Bard HVAC water loop and hydronic applications where maintaining a steady design flow is critical for stable performance and proper heat transfer. Replacing a worn or incorrect valve with the correct 8603-019 helps keep the unit operating within Bard specifications by supporting consistent water circulation across normal pressure changes in the system. Verify your unit model and the required flow rate before ordering, since matching the specified GPM and connection size is key to proper fit and dependable operation.