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.

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

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

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

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.

Specifications

ASIN	B00A6TZCKI
Best Sellers Rank	#40,512 in Kitchen & Dining ( See Top 100 in Kitchen & Dining ) #17 in Brewing & Fermentation Airlocks
Date First Available	November 20, 2014
Item Weight	1.58 ounces
Item model number	B00A6TZCKI
Manufacturer	FastFerment
Product Dimensions	6.5 x 5.71 x 1.81 inches

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Khalid Z.

Great experience from order to delivery. Highly recommended!

1 week ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

View all Trustpilot reviews