Abstract: The connector comprises a rigid, tubular insert having a first end, a second end and at least one third end, onto which the ends of first and second branches of a main pipe and of a secondary pipe are fitted respectively, and a covering of plastics material which encloses the ends of the insert and the ends of the pipes. The covering has a continuous internal circumferential projection in correspondence with each end of the insert, the projections being adapted to engage corresponding annular grooves in the ends of the two branches of the main pipe and of the secondary pipe so as to lock the pipes on the respective ends of the rigid insert and create liquid-tight seals.