We are often asked why we don’t sell a rubber stopper along together with our air locks, bundled together so to speak. I mean what good is an air lock without the rubber stopper to fit it to something? Well, the answer is really pretty simple.
Rubber stoppers come in all different diameters–from the size of a dime on up to the size of a orange. The size of rubber stopper you need depends on the what you are trying to attach the air-lock to. For this reason alone we will never be able to sell a rubber stopper and air lock together.
Glass wine carboys have a different sized opening than a gallon glass jugs for example. One takes a size #7 rubber stopper while the other one takes a #8. If you’re using a plastic fermenter you may only need a size #2 rubber stopper. It just depends on the size of the opening.
You may want to take a look at another blog post that covers what rubber stopper fits what. You can also visit our website for more information about the rubber stoppers we have to offer.
Ed Kraus is a 3rd generation home brewer/winemaker and has been an owner of E. C. Kraus since 1999. He has been helping individuals make better wine and beer for over 25 years.