The Modine HD Hot Dawg heater limit control part keeps the unit from overheating if a malfunction happens.
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Modine Part #
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Fits Modine Models
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3H40078-3 (replaces 5H75769-1 & 5H75001)
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HD30, HD45, HD125, HDS30, HDS45, HDS125
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3H40078-2 (replaces 5H75769-2)
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HD60, HD75, HD100, HDS60, HDS75, HDS100
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Item # 4015, 4015170, 4015180