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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FastRack 3-Piece Airlock Set for Fermentation (Set of 2) | Includes Transparent Airlocks and Drilled Rubber Stoppers – Hydrolocks for Fermenting Beer, Wine, Mead, and More | Fits Carboys & Fermenters

Product ID: 994290

🔍transparent design for clear fermentation monitoring

⚙️3-piece airlock for efficient CO2 release

🛡️airtight seal prevents oxidation

S/.80

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Sold byAmazon PeruDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🍺 Unlock the perfect ferment—see, seal, and savor every batch!

BREW LIKE A PRO - Durable, food-grade plastic ensures safe, long-lasting use for all your fermentation projects.
SEE THE MAGIC HAPPEN - Crystal-clear airlocks let you visually track fermentation progress without opening your fermenter.
TRUSTED QUALITY GUARANTEE - Backed by FastRack’s commitment—if anything’s off, they’ll make it right, no questions asked.
EFFORTLESS PRESSURE CONTROL - 3-piece design automatically releases CO2 while blocking oxygen, protecting your brew’s flavor.
UNIVERSAL FIT SECURE SEAL - Pre-drilled, tapered rubber stoppers fit most standard carboys and jugs, locking in freshness.

The FastRack 3-Piece Airlock Set includes two transparent airlocks and drilled rubber stoppers designed for most standard carboys and fermenters. Made from durable, food-grade plastic, these airlocks provide airtight sealing to prevent oxidation while allowing CO2 to escape automatically. Their clear design offers real-time fermentation monitoring, making them ideal for brewing beer, wine, mead, and more. The set combines efficiency, universal compatibility, and trusted quality to elevate your homebrewing experience.

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Fantastic experience overall. Will recommend to friends and family.

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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