A device intended to be used to couple together any type of powered ventilator to any kind of breathing circuit system, making them compatible for use. By using this device it is then possible to use alternative combinations of ventilator and breathing circuit from different manufacturers. This will assist, e.g., a hospital to be flexible in the choice of breathing circuit or system and allowing for the introduction to new kinds whilst the ventilators may remain the same. This is a reusable device.