A thread protector is a small, bottle like cap, that can be twisted on top of a tank. This is more commonly used on high pressured (or nitro) tanks due to the fact of how expensive they run. A thread protector does exactly what it says, protects the threads when the tank is not in the marker. Commonly the head of the tank will get nicks and bangs, which in turn can ruin the threads and strip them, which can put you out another $50.
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