OEM O-Ring 0.21" Thk X 19.95" Id -389 70 Duro #S301744 - OEM Seal and Gasket Replacement for Case Construction Equipment This OEM replacement part is used to repair oil leaks, dust intrusion, and failed sealing surfaces, helping correct oil leaks, seepage, contamination entry, and worn sealing lips on Case construction equipment. Aligned with search intent around oil leak repair, o-ring replacement, and Case equipment gasket service service parts. More Details Part Number: S301744 Application: Seal or gasket replacement used to repair fluid leaks, worn sealing surfaces, contamination entry, and failed OEM sealing points. Key Features: OEM replacement for worn seals, failed gaskets, or damaged sealing points Helps restore fluid containment and protect against contamination entry Direct-fit service part for leak repair and routine maintenance replacement Fits Case Models: Compatible with various Case construction equipment models - verify fitment before ordering Replaces: Refer to manufacturer cross-reference if applicable