Twin Bubble Airlock and Carboy Bung (2-Pack) | Fermentation Airlocks for Homebrewing Beer, Wine, Mead, and Kombucha

Great for homemade wine making. I used these without the stopper on my primary fermenter and with the stopper on my secondary glass carboy. They are well made and work very well. I did notice the stoppers liked to slip up out of the neck of the glass carboy a little so I had to tie them down into the neck but this may be unrelated to the stopper itself.

Works great. Great price b

I bough this to make a primary fermenter out of a 5-gallon bucket lid. It was super easy. Just had to buy the right grommet and drill a hole. Some measurements as I thought it may help others: Outside Diameter of the air lock stem is 7/16" (0.43" as measured by my caliper) I purchased a 3/8" nominal rubber grommet (0.375" inside diameter) for a nominal hole side of 1/2". I used a step drill to make a hole just slightly larger than 1/2". It may have been closer to 9/16ths. Step dril works great for this as you can size it up slowly to test your fit, and the step shoulders de-burr the hole. Installed the grommet, and pressed in the air lock. It is a tight fit and the rubber grommet is firmly, but not over-compressed. It has formed a tight air seal and the fermenter is bubbling as a I type. Air lock is a simple device that works great.

Ordered two airlocks, but only received one. But did receive gallon jug with bing and cap for jug. I’ll call it a wash in my favor! I read the description more than once-said two airlocks and 0 about the other items. Guess have to try it out! Plastic airlock…

Works good for wine jug

Works well

Fast delivery

Been using these for three years and they’re still kicking so they still work rubber still good everything

It only just arrived, so I only gave gotten to test the fit so far, but it's absolutely perfect. I'm brewing cider in a 23L glass fermenter. The bung I got from the homebrew shop just did not fit at all and I had to tape it down for the previous brew. This one fits perfectly, very securely, and the air lock fits just as securely. I was looking at caps and was astounded at their price in Australia. This fella will surely provide a better seal, though. And the hollow design means that it should fit a slight range of diameters with its ability to flex. Simple is best!

Muy funcionales, material resistente de buena calidad, fácil de lavar, cabe en la boquilla de una garrafa de un galón, muy útil para que las fermentaciones no se avinagren

These are actually great quality for the price. The rubber stoppers are good quality rubber and the plastic is decent quality as well. They work perfectly as advertised. I recommend for anyone interested in buying to check rubber stopper measurements and the measurements of the hole on your jug or carbon to make sure you buy the right size. Would recommend to others and buy again in the future.

Quality is good

The product is made out of plastic not glass. In the discription of the product they should have mentioned it. The red cap does not have any holes it it .The built up vapour travells from under the cap and escapes outside .But the product still works .