Bobbin Heater are used with an external pipes usually for oil and gas heating, the main advantage is easy replacement and very efficient. The heating element is supported by the refractory bobbins. Bobbin heaters are also supplied with protection tubes.Specifications:Heater Diameter: 25, 30, 35 mmSheaths Grade: SS316, SS310, Inconel 800, Titanium Voltage: 120 V, 230 VType of Termination: Cable