REPLACEMENT WATER PUMP O RING SEAL FOR M939A2 SERIES TRUCKS WITH THE 8.3 CUMMINS TURBO MOTOR.

I ALSO HAVE WATER PUMPS THAT COME WITH THE O RING # 3806180 IN STOCK

NOT FOR USE WITH NHC-250 CUMMINS TRUCKS.

PART #3902089 NSN 5331-01-272-1123 ,  5331012721123