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Before buying, work out whether you need a high-temperature shipping or a low-temperature beginning temperature start: When the temperature reaches the set temperature, switch on the power to start the device. (For example, when it reaches eighty degrees, switch on the power of the circulating pump)Low temperature start: When the temperature reaches the set temperature, carry to an finish the power to turn off the device. (eg, attain eighty degrees, turn off the heater)The threaded interface is a 4-point outdoors thread interface. The diameter of the exterior thread is decided 20mm.