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Lochinvar & A.O. Smith 100112339 Gas Valve 321894-706 While some universal boards existThe Lochinvar & A. O. Smith 100112339 Gas Valve is an OEM spec replacement engineered for high recovery commercial and residential liquid propane (LP) water heaters. As many technicians know, maintaining precise manifold pressure is non negotiable for clean combustion; this unit is factory regulated to a 10" WC output to ensure stable firing rates. It serves as the direct replacement for retired part numbers including 9007891005, 6911136, and