Membrane ADV made to be mounted onto an in-line counterlung or directly on a head of a unit. The membrane ADV ensures a precise and exact addition of diluent whenever you need it. An ingeniously simple construction ensures the maximum reliability. A second stage valve is made from four parts and two sealing components. This means it is virtually unbreakable and simple to maintain. The ADV incudes an isolator which shuts off the ADV if necessary. During the manufacturing only high quality materials were used to ensure a stable quality and function. All ADV types are fitted with a bayonet connector. Divesoft membrane ADV is an original product of the Divesoft company. To mount it on a third-party unit a purchase of an adapter is necessary.