and deactivatable to disconnect the locking means and allowing the conveying member to be disconnected the locking means and the body are engageable disengageable by means of a relative rotation less than ninety degrees application_number US 55656706 A description with reference to figures from 1 to 4 it is indicated as a whole by 1 a fast fit coupling for a fluid circulation system of which only a fluid conveying pipe 2 is shown the coupling 1 is adapted to reciprocally and fluid tightly connect a plurality of pipes 2 and is defined by a hollow body 6 comprising a plurality of cylindrical conduits 3 only one of which is shown having respective axes a and adapted to be releasably engaged by respective pipes 2 the description that follows will make reference for simplicity 39 s sake without loosing in generality to a single conduit 3 and to a single pipe 2 the conduit 3 is open outwards through an opening 4 adapted to allow the pipe 3 to be inserted disconnected according to respective connection directions i d reciprocally opposite and arranged in use parallelly to axis a and presents a shoulder 5 arranged on the opposite side of the opening 4 and recessed on an inner wall of the conduit 3 towards the axis a the coupling 1 comprises a locking assembly 8 adapted to lock the pipe 2.