Comprises a 5' length of unbraided black rubber oxygen tube with a Mk.3B* (stores reference 6D/101) bayonet connector at one end. Earlier types were covered in braided/woven cloth to help insulate against freezing at altitude, but later examples were manufactured using an improved rubber compound developed to be more resistant to freezing, thus aleviating the need for any covering. The rubber is generally quite flexible but does have quite a lot of surface cracking/crazing. The 3B* connector is in very good condition. Now exceptionally rare. Stock code O27455.