... Features The structure of tubular electric heating element is in a metal tube into the heating wire, and the gap ... through the two educing club connecting with power, it has a simple structure, long life, high thermal efficiency, good mechanical ... magnesium oxide Tube Material: Stainless steel seamless pipe, welded pipe, copper, yellow brass pipe, carbon steel pipe Common diameter:Φ22,Φ20,Φ18,Φ16,Φ14,Φ ...