Abstract: The instant specification refers to a connector structure used in vehicle fluid lines, such as vehicle fuel lines, used between a fuel tank and an engine and return lines. The improved connector structure facilitates quick assembly. The connector structure includes two parts, the smaller one acting as a lock for another connector which may be coupled to the connector structure. The new connector structure is constituted by a body which provides a housing for a lock, which has two movements. One movement permits the insertion of another connector into the connector structure, when it is pressed, and the subsequent locking in place of that connector after its insertion and a second opening movement, when one of its walls is pressed, which opens the lock and permits the removal of the other connector.