The present disclosure relates to an infusion tube system and a method for manufacture of infusion tube system. An infusion tube system comprising an infusion tube and a connector attached to the infusion tube at an end of the infusion tube is disclosed, the connector having a proximal end and comprising a connector body extending from a distal end to a proximal end along a center axis and defining a cavity, the connector body comprising an end wall with an inner surface, and at least one vent opening including a first vent opening, and a sidewall extending from the end wall along the center axis with an inner and outer surface, wherein the connector comprises a membrane covering the at least one vent opening, the membrane being welded to the inner surface of the end wall along at least one welding seam including a first welding seam such that the membrane covers and seals the at least one vent opening.
