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Bard part number 5651-042 is an OEM natural gas combination valve used in Bard wall mounted gas/electric HVAC equipment to control and regulate gas flow to the burner assembly during heating operation. Listed by Bard as NAT VALVE VR800A1012 (also referenced as 207871), this valve is designed to match factory control and safety requirements for proper ignition and stable burner operation when paired with the correct ignition module and manifold setup. Because gas valves can vary by inlet and outlet sizing, regulator settings, and appliance application, confirm the exact Bard model and serial number and cross-check your unit parts list before ordering to ensure correct fit and safe replacement.