Fuel cap, P/N MS35645-1, 486268. NSN 2590001419758 / replaces 2910001419758 and 2910001419245. Used on many M-series trucks M35, M37, M809, M54 etc, various military generator sets, etc. Not for the M35A3 or M939 series trucks. Rubber seal is compatible with gasoline and diesel.
Can be set for vented or non-vented use with valve on underside of cap.