Cable, Adapter: Straight Extension, 18" length: Adapts Naval U-75/U to Dual General Aviation plugs. This cord is used to adapt the Naval & Forestry Service U-75/U plug to connect to General Aviation radios in civilian aircraft. The U-75/U plug is used on communication cords of Naval oxygen masks like the MBU-14 and MBU-23, and flight helmet drop cords for both Navy and US Forestry Service. This cord only adapts the plug, does not convert military avionics to civilian. Unissued.