that is a small co2 (7 or 9 oz i think i cant remember though) tank that has a thermo valve, the thermo valves (IIRC) are still used on some food service type tanks. the termos were just a nother style of valve that a lot of people semed to like and some people still perfer them (cant blame them, the on off style valve is kinda nice)
-matt
-matt
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