Aircraft Fuel Pipe Coupling

A coupling for connecting fuel pipes where at least one of the fuel pipes is double-walled, the coupling comprising

• a pipe end fitting, the pipe end fitting including a male outer surface and a female inner surface,
• a double-walled socket arrangement, the double-walled socket arrangement including a female outer socket and a male inner shaft, the pipe end fitting being at least partially accommodated in the region between the female outer socket and the male inner shaft,
• a first seal ring providing a seal between the female inner surface of the pipe end fitting and the male inner shaft of the double-walled socket arrangement, and
• a second seal ring providing a seal between the male outer surface of the pipe end fitting and the female outer socket of the double-walled socket arrangement, wherein
• the coupling is so arranged that the pipe end fitting and the double-walled socket arrangement are able to pivot relative to each other.