2445R220D4 Seal Fits KOBELCO SK220, SK250, SK270, III IV VOne New Aftermarket Replacement Dipper Arm Dust Seal for Kobelco Excavators This aftermarket replacement dipper arm dust seal (part number 2445R220D4) fits at the bucket pin and dipper arm pivot points on Kobelco SK series excavators. The seal keeps contaminants out of the pin bore, protecting against premature wear in high cycle digging applications. This part is also used as a bucket pin seal on compatible machines. Specifications Type: Dipper Arm