Lennox 47K19 Defrost Sensor then apply an additional 1 4 then apply an additional 1 4 turn with a wrench thermal shock The Lennox 47K19 Defrost Sensor is a critical OEM replacement part designed for high performance heat pump maintenance The 47K19 and 47K1901 are the exact same component with identical specifications
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Lennox 47K19 Defrost Sensor then apply an additional 1/4