Can be used for home-brewed , , cider and other uses. Application:Pure juice fermentation, such as white fermentation, red secondary fermentation, back-flush into the fermentation during ambient temperature changes in the room.This style airlock is typically used on fermenters up to 20 Gallon. Fill water into the exhaust , insert to the cover of the brew barrel or rubber plug on the top of the fermentation container, cover with the lid. S-Shape Air Lock Twin Bubble Fermentation Making 5x S-Shape Air Lock with snap-on caps Size for manual measurement, there may be a 0 to 1 cm error, belongs to the normal phenomenon. Please use boiled water to boil and the Air Lock before you using it. And clean it with water after using. Color: Transparent After both sides of the exhaust valves water in the state, gently insert the brewing bucket lid. When was ferment generated bubbles through the exhaust discharged to buckets outside Specification All the fermentation process is in normal temperature automatic fermentation exhaust without manual control. After sterilized adding water to the exhaust . Function:Isolate the air from the /, discharge , flying into the / Size: See the picture Material: All The Fermentation Process Is In Normal Temperature Automatic Fermentation Exhaust Without Manual Control. Specification Fill Water Into The Exhaust , Insert To The Cover Of The Brew Barrel Or Rubber Plug On The Top Of The Fermentation Container, Cover With The Lid. 5x S-Shape Air Lock With Snap-on Caps After Sterilized Adding Water To The Exhaust .