4065687 Seal Dipper at Link EX150 Fits HITACHI EX150, EX160One New Aftermarket Replacement Dust Seal (Dipper at Link) for Hitachi and Fits John Deere Excavators This aftermarket replacement dust seal fits at the dipper to link pin joint on the excavator arm linkage. Also known as a grease seal or pin seal, it prevents contaminants such as dirt and debris from entering the pivot joint while retaining grease, protecting the pin and bushing from accelerated wear. Part number 4065687 is the Hitachi OEM number;