$2.94
An oil seal keeps lubricant sealed inside a rotating assembly and blocks contaminants from working in past the shaft, and this seal replaces a worn or weeping original at that shaft interface. The flexible lip that rides on the shaft hardens and wears with hours and heat until oil seeps past it, so a fresh seal restores the barrier before lubrication is lost.
Oil seals keep lubricant sealed inside a rotating assembly and block contaminants from working their way in past the shaft, and this seal replaces a worn or weeping original at that shaft interface. The flexible lip that rides on the shaft hardens and wears with hours and heat until oil begins to seep past it, the leak that calls for a new seal before lubrication is lost.
It presses into its bore and seals against the shaft turning through it. Match the inner and outer diameter and the width to the seal being replaced, since the press fit in the bore and the lip fit on the shaft both have to be correct for it to seal.