This hardened plastic adapter has a threaded connection designed to fit the 300ml ARS equine collection bottle on one side and a flared lip on the opposite to fit into either of our Missouri-style A.V. bladders. It is a design for those who do not use the disposable collection kits, but rather connect a collection bottle and filter directly to a latex liner or bladder. Washable and reusable over and over again. This short adapter also holds the collection bottle at the same angle as the outlet of the A.V.