... A269,A249,EN,TP304,321,316L.... Appliance:electric heater,heater elements O.D.:from 6mm to 23mm Features: 1) Production ... ) Product applications and applicable field:all kinds of metal tubular heaters, hot runners, temperature controllers/heaters, air-conditioning, ... and technical strength. In response to customers' requirements for the electric heating tube manufacturing process, we havr worked ...