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Bard part 5651-164 is an OEM 24-volt natural gas valve with 1/2 inch inlet by 3/4 inch outlet connections, used in Bard gas heat sections that operate with intermittent pilot ignition. When the furnace control calls for heat, this valve is energized to open and regulate gas flow to the burner assembly; when power is removed it shuts the gas off, helping the unit cycle safely and consistently. If you are troubleshooting no-heat, pilot issues, or burners that will not stay lit, replacing a faulty gas valve with the correct Bard 5651-164 helps restore proper ignition and heat operation. Confirm gas type (natural gas), voltage (24V), and pipe size at the unit before ordering to ensure correct fit.