The Evolution Aqua 3/8 inch BSP Male Stud Connector Air Fittings are suitable for use with the Evolution Aqua EazyPod and Nexus filters, these connectors feature a quick insert and release system on one side and a 3/8 inch BSP male screw thread on the other for easy installation. These fittings will screw into the Mini Ball valve and then allow a Evolution Aqua 12mm air tube to be push in to produce an air tight seal