These are plugs for Thermo brand or generic (will fit several other manufacturer's valves... Halcyon, Dive Rite, Sea Elite, etc) modular valves. This allows you to break down an isolation style manifold and use the valves as singles.
Please Note: There are 2 types of threadding on these plugs. The plug with the little "notch" on each edge of the hex head is intended for the right side/standard valve and is reverse threadded. The plug with no "notches" is intended for the non-standard/left side modular valves and has standard threadding.
