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Bard part 5651-034BX is an OEM natural gas valve supplied as a boxed service part for Bard wall mounted gas heat packages and other Bard heating applications. This valve controls and regulates the flow of natural gas to the burner during a call for heat, helping maintain safe ignition and stable heat output when the control board energizes the gas circuit. It is commonly referenced as a 1/2 inch by 3/4 inch natural valve, so confirming your unit model and the original valve connection sizes before ordering is important for proper fit and leak free installation. Because gas valves are a safety critical component, installation and gas pressure setup should be performed by a qualified technician following Bard service documentation and local codes.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.