The brass stem on a regulator, this one is left-hand threaded.
A brass regulator stem is the part that protrudes out from your regulator and attaches, via a regulator nut, to your CO2 cylinder. This is a left-hand threaded stem which should work on most standard CO2 regulators that take a left-hand thread. This works wonderfully as a replacement if your regulator stem is damaged or missing!
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