Hollis Manifold Side Plugs Left and Right

The Hollis Manifold Side Plugs covert Left and right Hollis tank valves into a single valve that is commonly used for sidemount scuba diving tank configurations. The Right-Hand blanking port valve plug has right-hand (normal) threads and the Left-Hand blanking port valve plug has left-hand (reverse) threads. It has notches cut into the nut head to be easily identified from the right-hand blanking plug.