Connector structure for a fluid tube the connector structure comprising a first connector body (13) connectable to a fluid tube (6), and a second connector body (14). The first connector body and the second connector body are adapted to be connected to each other and provided with mating surfaces (16, 17) to create a fluid tight seal between the first connector body (13) and the second connector body (14). The mating surfaces (16, 17) comprise only vertical and/or oblique parts and the connector structure is provided with a locking mechanism (18) and that the mating surfaces (16, 17) have been arranged to press tightly against each other and form a fluid tight seal with the locking mechanism (18) and the first and the second connector body (13, 14) are arranged to detach from each other without correct use of the locking mechanism (18). The connector structure may be used in a sampling tube of a patient respiratory gas tubing.
