What size - diameter in inches across thie top of bottle or jug - do they fit?

I see a few people have attempted to answer this and they were not very accurate. The bottom of the flair is 1 1/8 in diameter and the widest point of the flair at the top is 1 3/8. The very top has a ridge which has a diameter of just over 1 1/2 inches but this portion can not be inserted into the bottle.

will this work on a .5 gallon plastic juice jug?

Thanks for shopping. This stopper is too large for a common plastic jug. You may want to consider a #6 or #6.5 rubber stopper for a common plastic jug with an inside opening diameter of 1-1/8in. Just measure the ID of your jug before purchasing to find the right size.

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🍻 Lock in your perfect brew with FastRack’s airtight precision!

EFFORTLESS SETUP USE - Simple assembly with water-filled bubbler airlocks that prevent spills and maintain airtight seals.
TRUSTED BREWING PARTNER - Backed by FastRack’s commitment to quality and customer satisfaction—because your craft deserves the best.
UNIVERSAL COMPATIBILITY - Includes drilled rubber stoppers that fit most standard carboys and fermenters for seamless integration.
PRECISION PRESSURE CONTROL - Automatically releases CO2 while blocking oxygen to ensure perfect fermentation every time.
DURABLE FOOD GRADE MATERIALS - Crafted from tough, transparent plastic for long-lasting use and clear visibility of your brew’s progress.

The FastRack 3-Piece Airlock Set (2-pack) features transparent, food-grade plastic airlocks with drilled rubber stoppers designed to fit most standard carboys and fermenters. This airtight system automatically vents CO2 while preventing oxygen entry, enabling precise secondary fermentation for beer, wine, mead, and more. Durable, easy to use, and backed by a quality guarantee, it’s the essential tool for serious homebrewers aiming for flawless fermentation.

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