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Choose Options Compare Quick view 104371-03 P104371-03 - OEM Lennox Armstrong Ducane Air Pressure Switch 0.55" As low as $34.99 This is a brand new OEM Lennox Armstrong Ducane upgraded Air Pressure Switch 0.55". It replaces the part numbers listed below.An air switch is safety designed to ensure that your inducer motor is... As low as $34.99 Choose Options Compare Quick view
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