... ASTM A269,A249,EN,TP304,321,316L.... Appliance:electric heater,heater elements O.D.:from 6mm to 23mm Features: 1) ... conditioning, refrigerators and other household appliances, electric heating, etc.4) Specification range:outer diameter:6mm-23mm; wall thickness:0. ... In response to customers' requirements for the electric heating tube manufacturing process, we havr worked out complete set of ...