Seal Kit for Construction Machinery 703-09-00221 Excavator. Premium quality hydraulic seal repair kit for construction machinery from topsealkit, delivers excellent sealing performance, superior wear resistance, and perfect fit for Komatsu PC600-8 PC700LC-8 excavators. This OEM equivalent swivel joint seal kit (Part No: 703-09-00221) is constructed with high-quality materials to withstand high pressure and extreme temperatures, ensuring reliable hydraulic system protection for heavy-duty construction, mining, and civil engineering projects.