The Opticap 4 Aervent is a capsule filter, manufactured by Merck Millipore. This product is used in laboratory filtration. It is equipped with 14-mm inlet/outlet connections, 16.0-cm horse barb length, and 1/4 inches vent/drain connections. It showcases a vent capsule-type structural design, designed and manufactured out of Hydrophobic PTFE material.