Does it work with glass water bottles (such as pellegrino bottles)? Thanks.

NO! Don't ever try to force carbonation into a glass bottle, unless you want to be blasted with shrapnel from the bottle when it explodes! These are for plastic PET bottles only.

What size is the big flat o ring on the inside? I need a replacement for my carbonator cap.

Hello,the size of the big O-ring inside are 26mm(outside diameter),18mm(inner diameter),4mm(line diameter).Thank you !

I've just got one of these, and it leaks when connected to a normal pet bottle. is this what the o-ring is for? or do i have a deffective unit?

Make sure the inner metal piece..the one with the hose Barb..is tight. It screws into the main part of the cap. Also that large washer is key to getting a good seal on the bottle. Mine gets screwed down so tight that when I remove the cap it's inside the mouth of the pet bottle.

will this take both liquid and gas assemblies?

Yes, you can use the liquid or gas assemblies ( liquid ball lock or gas ball lock)

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FERRODAY Stainless Steel Carbonation Cap, Carbonator Cap with 5/16 Barb

Product ID: 34097635

Details

Bottle Type
Standard or
Brand
Ferroday
Capacity
3.5 ounces
Color
silver
Material
Stainless

🍺Fits most PET bottles for easy forced carbonation

⚙️5/16” barb for secure, leak-free CO2 connection

🛡️Heavy-duty stainless steel, rust & corrosion-proof

¥3409

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🍻 Elevate your homebrew game with leak-proof, stainless steel precision!

READY FOR YOUR NEXT BREW - Lightweight yet robust at 3.6oz, with replacement parts included to keep your carbonation game strong.
EFFORTLESS CARBONATION SETUP - Quickly attach to PET bottles with a ball-lock gas disconnect for flawless forced carbonation every time.
VERSATILE CLEANING COMPANION - Not just for carbonation—perfect for cleaning beer, soda, water, and juice lines with ease.
LEAK PROOF SEAL ZERO WORRIES - Food-safe, high-resilience rubber gaskets and extra O-rings guarantee airtight, no-drip performance.
BUILT TO LAST BREW AFTER BREW - Premium stainless steel ensures rust-free, long-lasting durability for your homebrew adventures.

The FERRODAY Stainless Steel Carbonation Cap is a durable, corrosion-resistant accessory designed for effortless forced carbonation of homemade beverages in PET bottles. Featuring a secure 5/16” barb connection and food-safe gaskets, it ensures leak-free performance and doubles as a cleaning tool for beverage lines. Lightweight and built to last, it comes with extra O-rings and gaskets for maintenance, making it a must-have for serious homebrewers.

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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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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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¥3409

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

Khalid Z.

Great experience from order to delivery. Highly recommended!

1 week ago

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The customer service exceeded my expectations. Perfect for buying products you can't find elsewhere.

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Best Sellers Rank	#56,154 in Kitchen & Dining ( See Top 100 in Kitchen & Dining ) #13 in Beer Brewing Kegs & Kegging
Customer Reviews	4.6 out of 5 stars 876 Reviews

FERRODAY Stainless Steel Carbonation Cap, Carbonator Cap with 5/16 Barb

Details

Details

Description

Specifications

Common Questions