The Zerostart 3600058 Thermostat cycles a heater on when fluid temperature is at or below +55°F and cycles OFF at +75°F. The threaded adapter is 1/2″ NPT.
It is a component of thermostatically controlled immersion heater systems. Use in conjunction with engine block or oil pan heater and Series Y-Cord to control heater usage.
Saves money by reducing engine heater operating hours, can be used on new installations or as a replacement part.