AWD. Cover plug. A removable Plug which screws into the housing and allows an access point to fill the Differential with fluid. Differential Cover Plug. Differential Drain Plug. carrier. Drain. Magnetic Type. Hole. Mount bracket filler. Included with: Axle assembly, Axle housing, Cover, Differential, Differential assembly, Differential carrier, Differential Cover, Difrntal assembly, Rear Cover.