A-42106-AI Seal (473238)One New Aftermarket Replacement Oil Seal for Krause, Fits Case IH, Fits Massey Ferguson, Fits Allis Chalmers, and Fiat Agricultural Equipment This nitrile oil seal (National Timken 473238) is a multi purpose, spring loaded dual lip seal used in disc harrows, tillage equipment, and various agricultural machinery where a 1. 875" shaft bore is required. The seal keeps lubricant in and contaminants out at shaft ends, bearing housings, and axle interfaces.