A propellant feed system for propellant tanks in a missile body 1 to a jet propulsion unit 6 which is mounted by a universal joint, includes a joint wherein the four limbs mounted between respective yokes 2, 3 and 7, 8 have sockets providing a seal and affording angular displacement between fuel or oxydiser pipes 9, 10 from tanks and pipes 14, 15 to the propulsion unit 6. The joint core structure has internal channels connecting each feed pipe 9, 10 with respective outlet pipes 14, 15. The construction avoids flexible hose connections. IMAGE
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