Center Joint Seal Kit for Construction Machinery 703-06-22210 Excavator. Premium quality hydraulic seal repair kit for construction machinery from topsealkit, delivers reliable sealing performance, superior durability, and perfect OEM compatibility for Komatsu PC50MR-2 PC55MR-2 excavators. This aftermarket premium center joint seal kit is constructed with high-quality materials to withstand high pressure and extreme temperatures, ensuring reliable hydraulic system protection for construction, landscaping, and small-scale civil engineering projects.