Our oil pump priming shafts are perfect for priming your engine before that first startup. These specially hardened steel priming shafts fit on any 3/8 in. or larger drill and will pressurize oil galleys to ensure against dry starts and ruining your engine. Don't fire up that engine without pre-lubing (priming) it thoroughly with oil and our oil pump priming shafts. Compare to Mopar Performance P4286800.