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. Very good condition. Stock code O15980.