Left Hand Side valve blanking Plug.
Save money and convert your side manifold valves into stand alone cylinder valves, with the use of a blanking plug.
The blanking plug has double o-ring protection.
Simply unscrew your manifold bar and screw in the blanking plug.
The left hand blanking plug has a reverse thread.
You can distinguish between the left and the right hand blanking ports by looking at the notches cut in the nut head of the left hand plugs.