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#7 Rubber Cap

Item Number: RC107

Availability: In stock

Price: $5.95
  • Buy 3 for $5.35 each and save 11%
  • Buy 10 for $4.76 each and save 20%

(RC107) 1-15/16 inch inside diameter. These stretch over the outside of the neck of your jug. They have a hole in the top to fit all of our air locks, except for the "Giant Hobby #2 Air Lock". These are preferred by some people over the rubber stoppers, and in some situations they work better.


Customer Reviews

"OK" Review by Lin (Posted on 10/1/15)

This seems to work OK, but I still haven't figured out the best way to get it on the carboy. Maybe my arthritic fingers have something to do with that. Comes off OK, but getting it on can be daunting.

"ruber cap" Review by shadylady (Posted on 7/20/15)

It's working very well. Never used one before and so far it's working great--

"Plastic carboy cap" Review by Daniel (Posted on 1/25/14)

I purchased two plastic 6gal carboys that require a different type of airlock attachment. This is the right tool for the job since it uses the same size 3/8" airlock that I have been using. To check pressure I just pull the bottom lip out and the bubble stop settles down and I can see how fast it climbs.

"a must have for carboys" Review by jd (Posted on 11/24/13)

If you use carboys to ferment these rubber caps. They're so much easier to use. Without the problem the stoppers have of being pushed up by the co2 fermentation.

"Great product, better than plugs" Review by Shed Man (Posted on 11/7/13)

This is a great product. Comes off easier than plug or stoppers with hole in it. This is kind like the old balloons people used to use to make wine and beer before the air-lock. You just pull over the top put in the air-lock and life is good.

"very handy" Review by chess (Posted on 11/9/12)

they fit the mess free application

"no mess, very good using air locks." Review by chess (Posted on 11/5/12)

pleased with product

"great product" Review by Birdie (Posted on 10/26/12)

I used these for 20 years. They work great.

"great product" Review by running bear (Posted on 10/20/12)

great product

"Just the Best!" Review by DD (Posted on 9/18/12)

Everyone should try more cork stoppers for us!

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