This polished rod sealer is designed for long-term operation with repeated fine adjustment. It uses specially formulated cone-shaped sealing elements and a three-stage sealing structure to ensure stable sealing performance.

The Stage II seal works as the main sealing component during polished rod operation. It can be gradually tightened through the fine-adjustment mechanism to compensate for wear and maintain effective sealing. The Stage I seal is designed for use when replacing worn Stage II sealing elements. The Stage III seal helps prevent lubricating grease leakage and blocks sand or impurities from entering the sealing chamber, protecting both the polished rod and sealing elements.