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Before buying, determine whether you would like a high-temperature birth or a low-temperature start start: When the temperature reaches the set temperature, switch on the power to begin the device. (For example, when it reaches eighty degrees, switch on the power of the circulating pump)COLD start: When the temperature reaches the set temperature, cut off the ability to turn off the device. (eg, reach 80 degrees, turn off the heater)The threaded interface is a 4-point exterior thread interface. The diameter of the external thread is ready 20mm.