The Dana 222041 is a genuine OEM fill or drain plug designed for use in various Dana Spicer axle, gearbox, and driveshaft component applications. This essential component features a 1" NPT (National Pipe Taper) thread for a secure, leak-free seal and requires a 12.7mm (1/2 inch) square drive wrench for installation and removal. It ensures proper fluid containment and facilitates maintenance for critical machinery parts.