The Eaton 129492 is a non-magnetic fill plug designed for rear axle differential applications. Used to seal the fill port on the differential housing, the non-magnetic design prevents it from attracting metal particles that can accumulate around a standard plug. This part is sold individually. A genuine Eaton part available from Pro Gear and Transmission – call us to confirm this is the correct plug for your axle.Interchanges:129492ETNDS129492EH129492ETN129492SP129492ZBP0129492FeaturesNon-magnetic design – will not attract metal debris at the fill portRear axle differential fill plug applicationSold as individual pieceUsed in these Dana Spicer models40 Series Single Reduction Tandem Drive AxleDS404 / RS404 Tandem Drive AxleDS405 Tandem Drive AxleDSH40 Tandem Drive AxleDSH44 Tandem Drive AxleDSP41 Single Reduction Drive AxleDST40 Tandem Drive AxleDST41 Tandem Drive Axle