4276696 O-Ring Fits John Deere 120C, 120D, 130G, 135C RTS, 135D, 135GOne New Aftermarket Replacement O Ring for John Deere Excavators This aftermarket replacement O ring is a sealing component used in John Deere compact and mid size excavators. O rings of this type prevent hydraulic fluid leaks and keep contaminants out of critical joints and fittings within the excavator's hydraulic and pin bore assemblies. Specifications Inner Diameter (ID): 112. 7 mm Outer Diameter (OD): 128. 9 mm Cross Section (CS): 8. 1 mm