... boxes 2.Low noise harden gear box 3.Harden gear reducer box Tairong Machiney ZLYJ Harden Gear Box for Plastic Extruder Machine I. Introduction ... the rotary direction is changed, please state when ordering. III. Model Type: - ZLYJ112, ZLYJ133, ZLYJ146, ZLYJ173, ZLYJ200, ZLYJ225, ZLYJ250, ZLYJ280, ZLY315 ...