Advantages:
-It is mainly used for rotary sealing in the center rotary joint of excavator.
-It is made of excellent polyurethane material. It has high characteristics of low pressure,high strength and high wear resistance
-Simple structure an easy installation.
| ITEM | ID | OD | L |
| JSROI | 50.5 | 61 | 4.9 |
| JSROI | 60.5 | 71 | 4.9 |
| JSROI | 70.5 | 81 | 4.9 |
| JSROI | 75.5 | 86 | 4.9 |
| JSROI | 80.5 | 91 | 4.9 |
| JSROI | 90.5 | 101 | 4.9 |
| JSROI | 95.5 | 106 | 4.9 |
| JSROI | 100.5 | 111 | 4.9 |
| JSROI | 105.5 | 116 | 4.9 |
| JSROI | 110.5 | 121 | 4.9 |
| JSROI | 115.5 | 126 | 4.9 |
| JSROI | 120.5 | 131 | 4.9 |
| JSROI | 125.5 | 136 | 4.9 |
| JSROI | 130.5 | 141 | 4.9 |
| JSROI | 140.5 | 146 | 4.9 |