... , JIS,EN,TP304,321,316L.... Appliance:high quality electric element,heater O.D.:from 6mm to 23 Features: 1) Production Standard ... , electric heating, etc.4) Specification range:outer diameter:6mm-23mm; wall thickness:0.40mm-1.50mm5) Annual production capacity: 800 tons6 ... the property of extensibility. sell stainless steel pipes for electric heater