The Eaton 127721 is a differential pinion oil seal. It measures 5.0 in. wide by 5.2 in. long by 1.9 in. tall. Sold individually, it fits the differential pinion position and is designed to contain gear oil at the pinion shaft exit point of the differential housing. Call us to confirm proper fitment for your axle application before ordering.Interchanges:1194279773EE73070Spicer EH127721S-5366FeaturesDifferential pinion oil seal for heavy-duty axle applicationsEaton part number 127721Dimensions: 1.9 in. height x 5.0 in. width x 5.2 in. lengthSold individually (unit of measure: each)Tech SpecsPart Number: 127721Part Type: Differential Pinion Oil SealDimensions (H x W x L): 1.9 in. x 5.0 in. x 5.2 in.Unit of Measure: EachUsed in these Dana Spicer modelsDS/RS 340-402 Tandem Drive AxleDT/RT 340-402 Two-Speed Tandem Axle