is it a measuring device?
no
is it a measuring device?
Is it used as a container?
bottlecap?
How about a ball valve?
Is it used during fermentation?
Rubber stopper/bung?
Airlock?
StarSan in the airlock
Hop bag.
A thermowell
Irish moss?
secondary
Can it only be used in conjunction with a carboy?
carboy cap
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