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Eaton Mears Manual Hi Limit 275 3254 for older spa systems has the familiar Red reset button found on many spa pack heaters from the early days. 3.0 long by 14 wide copper capillary bulb is attached with a 6 length of copper wire. Bulb inserts into thermowell, and will trip the high limit when temperatures exceed 121 degrees Fahrenheit. Single pole, Single Throw SPST 25 amp hi limit is used on Len Gordon, Brett Aqualine and Hydroquip spa controllers, among other non digital air activated spa controls.
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