Are these airtight on a 1 gallon glass carboy?

Only if your carboy is a 38mm / 400 opening

What is the inside and outside dimensions in inches of the lid?

What you need are the INSIDE of the LIDS and the OUTSIDE of the JUGS. The lids are 38mm INSIDE just as stated in the ad. Now measure your Jugs OUTSIDE and see if it matches/ Measuring the outside of the lid is like measuring the outside of a shoe - why do it? Your foot goes inside the shoe right? Have a pleasant Holiday Ron HD

What is the material lining the inside of the caps?

It looks like some sort of Styrofoam. It doesn't cover the whole cap only around where the edge of the bottle sits on the cap.

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Home Brew Stuff White Metal Growler Caps 38mm Fits Standard ½ and 1 Gallon Jugs sold in Homebrew Industry

Product ID: 281486300

Details

Brand
FastRack
Capacity
3.63 kg
Colour
White
Material
Metal
Product care instructions
Hand Wash Only

🧴Fits ½ & 1 gallon jugs

⚙️Durable metal build

🇺🇸Made in USA quality

¥4998

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🍺 Lock in your brew’s boldness with every cap!

BATCH READY PACK - Includes 12 caps—perfect for homebrew enthusiasts and small batch brewers
PROUDLY AMERICAN MADE - Manufactured in the USA, supporting local craftsmanship and quality assurance
SECURE SEAL EVERY TIME - Precision 38mm fit locks in freshness and carbonation
VERSATILE COMPATIBILITY - Designed to fit standard half and full gallon growlers effortlessly
PREMIUM METAL DURABILITY - Crafted from sturdy white metal for long-lasting use

Home Brew Stuff White Metal Growler Caps are precision-engineered 38mm metal caps designed to fit standard ½ and 1 gallon jugs. Sold in packs of 12, these durable white metal caps ensure a secure seal to maintain freshness and carbonation, making them an essential accessory for homebrewers. Proudly made in the USA, they combine quality craftsmanship with practical functionality.

Specifications

ASIN	B00S1UJ2Y6
Brand Name	FastRack
Capacity	3.63 kg
Color	White
Customer Reviews	4.5 4.5 out of 5 stars (633)
Global Trade Identification Number	00742436713726
Included Components	12 Metal Caps
Item Weight	0.11 Pounds
Manufacturer	Home Brew Ohio
Manufacturer Part Number	4330AX 12
Material Type	Metal
Model Number	75012WT
Number of Items	12
Number of Packs	1
Product Care Instructions	Hand Wash Only
Shape	Round
Style Name	Gallon
UPC	642125537742 628504293225 742436713726 628504293188 055848000170
Unit Count	12 Count

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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.

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¥4998

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Received my product in pristine condition. Great service overall.

1 month ago

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