Craftsman Snowblower Gearbox Oil Seal 921-0338 0.33 x 4.00 x 4.00 Genuine OEM Replacement Fits Craftsman MTD Toro Cub Cadet. This is a Genuine OEM Craftsman part. Basic InformationPart Name: Snowblower gearbox oil sealManufacturer: MTDCategory: SnowblowerPrimary Function: Seals the gearbox around the shaft to prevent oil leaks and protect internal components from debris an... - Craftsman Snowblower Gearbox Oil Seal 921-0338 0.33 x 4.00 x 4.00 Genuine OEM Replacement Fits Craftsman MTD Toro Cub Cadet.