I have been given dozens of these things, there plastic look like they fit into the top of the demijohn, with a little rubber disc in the center, under that are two little holes. I assume these are used to replace airlocks when bulk ageing?
Has anyone seen or used them? do they work? and with them being secondhand are there any faults i should look for before using them?
Has anyone seen or used them? do they work? and with them being secondhand are there any faults i should look for before using them?
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