PURPOSE: To reduce the occurrence of a trouble during separation and to facilitate mounting by providing a nozzle mounted on the one end of a separable piping and having a spherical tip and a coupling loosely mounted on the other end and having a spherical tip brought into pressure fitting to the tip of the nozzle.

CONSTITUTION: The pay-load side of a separating joint comprises a nozzle 15 and a seal 16 and is fixed to a bracket. The rocket side for a space has a cylindrical guide 13 fixed to the bracket, and a nozzleform coupling 14 is inserted from a position below the guide 13. A nut 12 is screwed in the guide 13 in a state that a fitting 11 is combined with a nut 12, the fitting 14 is pushed up through the seal 16 togetherwith the fitting 11, and forced into pressure fitting to the tip of the nozzle 15. The pressure fitting surfaces of the fitting 11, the coupling 14, and the nozzle 15 respectively form a spherical surface and are coupled to each other. The coupling 14 is not fixed and therefore, follow-up to angle miss alignment during mounting is practicable.