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Bard 5651-160 is an OEM natural gas valve with 1/2 inch by 1/2 inch connections used on Bard wall mounted gas/electric units with direct spark ignition to regulate and safely shut off gas flow to the burner manifold during heating operation. A weak or sticking valve can cause ignition failures, delayed light off, or nuisance lockouts, so replacing it with the correct Bard factory part helps restore proper flame control and reliable heat output. Verify your unit model and serial, confirm natural gas application (not LP unless converted), and match the original wiring and inlet/outlet orientation when installing to maintain correct operation.