Outer hub oil/air seal for M939A2 series trucks, M916A3, M917A2, and M917A2 w/MCS. Seal keeps oil out of the hub center and holds CTIS air pressure. There are two of this seal in each hub. P/N A-1205-D-2162, replaces A-1205-N-2120, 12377579, 77993TA0, 357974TA0. NSN 5330013080175.
Seal must be installed with the "non pressure side" mark facing the proper way or the seal will fail.