Eaton Spa Mechanical Thermostat 36in x 516in Capillary Bulb SPSTInvensys Eaton Mears 275 3124 01 with 516 diameter capillary bulb, is a standard mechanical spa heater thermostat used on older spa pack control systems from Allied, Len Gordon, Brett Aqualine, PresAirTrol. Factory set, but adjustable spa thermostat has a 36 capillary wire with a 4.15 long x 516 wide copper capillary bulb that is placed into a thermowell not included. Thermostat is screwed to the back of the panel or heater housing, with the knob attachment pointing outward. SPST wire connections are 14 standard tabs. 275 3124 01 replaces or supersedes 72026, and P30830.
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