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This stopper has two holes and is is also sold in conjunction with the #10 stopper thermowell. It features one 3/8" hole and one 1/4" hole.
A racking tube or stainless tube can be inserted into the 1/4" hole, forming an airtight seal, and the 3/8" hole fits an airlock. Even after you wedge all these fittings into it, it still fits a plastic carboy neck! Use this in any configuration you can think of, it'll fit: Airlocks, Thermowells, Racking Canes, and anything else you can imagine!