A More Complete Brewing Airlock Kit - If you need a fermenting airlocks that can be used for a long time and you don't want to buy them often, but you also want a favorable price. Then get Airlock combination. You get 6pcs Bubble Airlocks + 6pcs #6 Stopper + 12pcs grommets.Just drilled 3/8inch hole for grommets or 1inch/1.28inch for stopper on the lid Improved High Transparency Bubble Airlock - Different than other normal S shape airlocks in the market,our fermentation airlock made of healthy material,more harder (no fragile)and more transparent.(Clearly see the whole fermentation process)Apply pressure slowing to the airlock when inserting into the drilled plug/stopper and they last a long time as it`s top quality transparent wine brewing airlock. Improved Cap & OFF -This type of dust cap has a zigzag design on the and not slide when opened. There are 3 buckles inside, it down gently, you can close it with a snap, pull it up and rotate to open it. The lid does not need to be drilled as there is space around it, which allows the gas to escape. Reusable & Widely Application - These Bubble Airlock Sets are solid and reusable.They can lasts for a long time.Just drop it in your and reuse it many times and many Widely used for: You can use these airlocks for fermenting beer, kombucha, pineapple, peppers, watermelon, salsa, and other beverages, these brewing airlock be the economical and o2-free way for your fermented items Colour:Photo Color Material:plastic Package Contents: 6 set x Twin Bubble Airlock Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.