... Ø126mm6 "Ø150mmØ155 – Ø158mm8 "Ø200mmØ205 – Ø208mm The air shaft introducing foreign advanced production equipment and fabrication technology, using imported ... filling gas for the nozzle jet, to make the shaft of off-axle apperance uniform expansion, thereby lock ... treated barrel can be unloaded. Performance and advantages: air shaft in practical applications, it has advantages of convenient operation, ...