Patent ID: 8172272

Claim:
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, the first seal ring is located within a first seal groove formed in the female inner surface of the pipe end fitting, 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, the second seal ring is located within a second seal groove formed in the male outer surface of the pipe end fitting, said first and second seal rings configured to be substantially co-planar, wherein the coupling is configured that the pipe end fitting and the double-walled socket arrangement are pivotable relative to each other and the pipe end fitting and the double-walled socket arrangement are slideable towards and away from each other with the first and second seal rings remaining substantially coplanar.