455378H is a Timken grease and oil seal. A seal like this keeps lubricant in the housing and keeps dirt and water out, which protects the bearings and other parts around it. Oil seeping at the seal, a scored or pitted shaft surface, and rubber that has hardened, swelled or cracked are the usual signs it is time to replace one. A genuine Timken part from Pro Gear and Transmission. Call us with your application and we will help confirm proper fit.FeaturesTimken grease/oil seal, part number 455378HKeeps lubricant in and contaminants outOil seepage, a scored shaft or hardened rubber signal it is time to replace the seal