Center Joint Seal Kit for Construction Machinery 703-06-23150 Excavator. Premium quality hydraulic seal repair kit for construction machinery from topsealkit, delivers excellent sealing performance, superior pressure resistance, and perfect OEM compatibility for Komatsu PC30MR-1 excavators. This aftermarket premium center joint seal kit is engineered to provide reliable hydraulic system protection, ensuring zero fluid leakage and minimal maintenance costs for construction, landscaping, and utility applications.