1 X Drilled Rubber Stopper #6.5 (Set of 3)

Lab grade. Of course it's for holding the bubbler in your carboy, but I was able to use one to replace the worn-out stopper in an antique thermos carafe, which was fun. Shipped fast; good supplier.

I decided that instead of buying a 1 gallon (empty) glass jug or carboy I would buy a 1 gallon jug of wine and then use that jug to ferment my wine after I drank it. I bought the Carlo Rossi jugs however; when I went to put my fermentation lock on, I was dismayed to find it did not fit. I quickly purchased the plastic screw on ones with the drilled center but found that they really did not seem to give an airtight seal when I put in my airlock set. I thought that I would have to break down and purchase new glass jugs but I was delighted to find that these fit perfectly and work with my 3-piece airlock set. I find that the rubber bung’s give a better seal. These work perfectly for the glass jugs with a smaller opening.

The cork on my vintage Jack Daniel’s Maxwell House bottle was badly deteriorating - leaving pieces in my pour. This stopper fits perfectly - after using hot water to remove the plastic washer holding the cork in place

it worked amazingly with 1 gallon carboys which i was needing but also needed it for a 5 gallon which it didn't fit ... it almost fell in,,, since i have 2 in which are 1 gallon,,, it definitly was worth the purchase for 3 as i had an old one that was discolored over time

Better than most, they are staying in not backing out. I will be buying more and replacing others

I was skeptical about buying these, since there seemed to be no definitive specifications regarding the dimensions and I have a non-standard 5-gallon carboy (1.15" top opening diameter), and some reviews indicated that the rubber would be unyielding or slick and therefore might not seat firmly even if the size was right. Fortunately, they seem to be exactly what I needed. I have yet to use them, as they just arrived, but based on the fit and the feel of the rubber, I am confident they are just about perfect. I am including photos of micrometer measurements of the top diameter (1.3"), bottom diameter (1.06"), length (0.97"), and an idea of the resistance of the material (which is similar, in my estimation, to eraser rubber--has a good amount of give and a 'sticky' surface so it wedges much of the way into the carboy and feels like it 'grabs' the glass well) to help future customers decide if this is the right stopper for them. (And no, as other reviewers have mentioned, these are NOT fermenthaus branded as is depicted in the product images--they are vintage shop brand. mine were supplied by Home Brew Ohio.) If I run into any issues when I put them into use, I will modify my review.

Exactly what I needed. They work perfectly.

Great for upcycling Carlo Rossi jugs. Will not seat properly if inside diameter is wet. Recommend use of funnel to allow for dry seating.

They're perfect! Good quality.

Excellent size and quality

Product as pictured. They fit the one gallon carboys.

They work good but the pack is too small for a serious brewer.

its a rubber stopper what can I say