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A coupling for fuel pipe includes a pipe end fitting, which includes a male outer surface including a groove and a female inner surface including a groove. The coupling includes a double-walled socket including a female outer socket and a male inner shaft. The pipe end fitting is accommodated in the

A coupling for fuel pipe includes a pipe end fitting, which includes a male outer surface including a groove and a female inner surface including a groove. The coupling includes a double-walled socket including a female outer socket and a male inner shaft. The pipe end fitting is accommodated in the region between the female outer socket and the male inner shaft. A first seal ring seals between the female inner surface and the male inner shaft. A second seal ring, which may be substantially coplanar with the first, seals between the male outer surface and the female outer socket of the double-walled socket. The coupling may be so arranged that the pipe end fitting and the double-walled socket are able to pivot relative to each other by up to at least ±2 degrees and are able to slide both towards and apart from each other.

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1. 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

1. 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, anda 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, whereinthe 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. 2. A coupling according to claim 1, wherein the first and second seal rings are arranged such that the angle between (a) a first notional line extending from the center of the second seal ring to a first point on the surface of the second seal ring and (b) a second notional line extending from the center of the second seal ring to a second point on the outer surface of the first seal ring, the first and second points being chosen such that their separation is minimized, is between 0 and 5 degrees. 3. A coupling according to claim 1, wherein the pipe end fitting and the double-walled socket arrangement are able to pivot relative to each other by up to at least +/−2 degrees. 4. A coupling according to claim 1, wherein the double-walled socket arrangement is defined by a first unitary part and the pipe end fitting is defined by a second unitary part. 5. A coupling according to claim 1, wherein one of the first and second seal grooves has a Gamah profile. 6. A coupling according to claim 1, wherein at least one of the double-walled socket arrangement and the pipe end fitting is connected to a double-walled fuel pipe comprising an inner pipe wall and an outer pipe wall. 7. A coupling according to claim 6, wherein the coupling is connected to the fuel pipe by means of a sleeve connected to the outer pipe wall of the double-walled fuel pipe and the maximum angle of pivoting between the double-walled socket arrangement and the pipe end fitting depends on the position of the sleeve. 8. A coupling according to claim 6, wherein at least part of the region between the female outer socket and the male inner shaft of the double-walled socket arrangement is in fluid communication with at least part of the region between the inner pipe wall and the outer pipe wall of the double-walled fuel pipe. 9. A coupling according to claim 8, wherein the fluid communication between the double-walled socket arrangement and the double-walled pipe is facilitated by at least one aperture located between the first and second seal rings. 10. A coupling according to claim 1, wherein the coupling is associated with a local drain port for the drainage of fuel from a region between the female outer socket and the male inner shaft of the double-walled socket arrangement. 11. A coupling according to claim 1, connected via a double-walled pipe to another coupling according to claim 1. 12. An aircraft including a fuel system wherein the fuel system comprises at least one coupling according to claim 1. 13. 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, anda 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 and the first seal groove and the second seal groove are arranged to move together, 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.