Coupling for a connector for fluid pipes with a metal wire spring

A coupling for fluid pipe connector, comprising:

• a female tubular base;
• a male tubular end-piece insertable into the base along an axial direction to form a sealed joint;
• a blocking element for blocking the end-piece in the base when the end-piece is inserted in the base, the blocking element elastically deformable in a radial direction and comprising a C-shaped rigid metallic wire with two free extremities bent towards each other and dimensioned for passing through the base when the blocking element is radially deformed;
• and
• a locking sleeve mounted around the blocking element and movable in the axial direction between a first axial position in which the locking sleeve allows deformation of the blocking element radially towards the exterior of the base and a second axial position in which the locking sleeve prevents radial deformation of the blocking element, the locking sleeve having at least one internal radial recess in which each corresponding free extremity of the blocking element is received when the locking element is radially deformed and the sleeve occupies the first axial position, each recess axially offset relative to the corresponding free extremity of the blocking element when the sleeve occupies the second axial position, thereby preventing radial deformation of the blocking element.