A resin barrier device (5) for an infusion tool (1) includes a tubular intermediate piece (15) having a first end (17), which is adapted for connection to a venting outlet (3) of an infusion tool (1), having an opposite second end (19) adapted to be connected to a ventilation line (7), and having a channel (27) surrounded by a pipe wall (25), which forms a fluid connection between the first end (17) and the second end (19), and a semi-permeable barrier wall (29) provided in the channel (27), which is arranged to let an airflow pass from said first end (17) to said second end (19) and to block a resin flow from the first end (19) to the second end (19).