DetailsThis S-bubble airlock is the preferred choice for secondary fermenters, as it allows you to monitor the pressure in the fermenter.
Fill to line with boiled water or sanitizer to create a closed system, which allows CO2 to escape, but doesn't allow air back in to contaminate your wine or beer.
- Details & Instructions
Height 6 3/4"
4.8 / 5.0124 Reviews3 piece worked better for me5 batches went just fine with the 3 piece, but when I bought a second carboy I thought I would try one of these. Broke after I finished my very first batch with this style. I know that the seal between the plastic and the rubber stopper was dry but didn't think this would happen.October 3, 2011Works well, Good designUnbeatable airlock for the money. It is hard plastic so it is much safer than the glass alternative. Cleans up relatively easy so its shape. Also speaking of shape, as long as you fill it up to the correct level you shouldn't have any problems sucking the liquid in or out of the lock. While it doesn't slide in and out of the bung plugs as easy as the glass lock, the safety factor is worth it.February 8, 2013Best Airlock EverI have both the 3 piece and S style airlocks and I love the S style airlock. The main reason being that you can very easily see when primary or secondary is under pressure (like it should be). It's also easy for counting bubbles. The only downside is cleaning it takes a bit more time.August 23, 2013good airlock for the moneyAirlock works but I still prefer the 3 piece airlocks as long as you don't loose one of the pieces. But overall this airlock works fine and is cheapAugust 28, 2013ExcellentThis was my third airlock I purchased from MidWest. I use it regularly to make cider and special wines. I have no problem with this airlockFebruary 12, 2013best airlockthis the only airlock i've ever used and it is great!!January 11, 2016WorksYou really can't go wrong when buying an airlock. For most purposes, a 3-piece or S will work just fine. I have read that S will evaporate slower so is more suited for long term fermentations, but I have had equal luck with the 3 pieces not evaporating fast. These are so cheap, no reason not to pick up a few.October 4, 2013The best valueIf you want a simple, inexpensive airlock that won't allow the liquid to back up into your brew, this is it.February 16, 2013Good for better bottlesThis air lock works well with Better Bottles. Better bottles flex and pull in air when lifted and this air lock can handle that. The 3 piece will suck in liquid in addition to air. I use them when aging beer.October 9, 2013
- Customer Q&A
Browse 2 questions Browse 2 questions and 3 answersHi. Do I need to keep the red cap on the s lock throughout the primary fermentation?BEST ANSWER: Shouldn’t have to, but the red cap will keep or lessen the amount of moisture from the a rapid or aggressive fermentation from blowing the fluid from the air lock.
Thanks for asking.All the water in my airlock went into one section instead of half in both. Is this ok?BEST ANSWER: Yes, that just means that there is positive pressure from the CO2 being produced by fermentation.