Stores Ref. 6D/481. Comprises a length of unbraided black rubber oxygen tube with a MK.IIIB* (6D/101) bayonet connector at one end and a a MK.IVA 'socket' connector (6D/482) at the other. These were used to enable the use of E-series, G-type and H-type masks in older aircraft fitted with early oxygen systems. These adaptors were also used to connect masks to portable oxygen bottles. There is stress crazing on the tube when flexed, otherwise in excellent used condition. Stock code O15981.