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Bard part number 5651-142 is an OEM natural gas SmartValve gas control used on select Bard gas heating sections to regulate and safely control burner gas flow based on 24V control signals. This valve is typically applied in intermittent ignition gas heat systems and is a fit critical component that directly affects ignition, flame establishment, and overall heat operation, so matching the exact Bard part number is important when replacing a failed or out of spec gas valve. If you are troubleshooting ignition issues, nuisance lockouts, or improper manifold pressure, replacing with the correct 5651-142 valve helps restore proper factory operation and safety performance when installed and set up to Bard specifications by a qualified technician.