A coupling for connecting the ends of medical apparatus tubes. The coupling has male and female conical mating elements on first and second end pieces. Each end piece is adapted to receive the end of a tube. The end pieces are locked together to prevent unintentional separation. Locking is achieved by at least one finger extending from one end piece to the other end piece. The finger, in addition to its locking function, resists tension when tensile stress is applied to a coupled tube.
