Application:Pure fermentation, such as white wine fermentation, red wine secondary fermentation,preventing back-flush into the fermentation chamber during temperature changes in the room.This style airlock is typically used on fermenters up to 20 Gallon. Usage: Fill water into the exhaust valve, insert to the cover of the brew barrel or rubber plug on the top of the fermentation container, cover with the lid. Function: Isolate the air from the wine/beer, discharge CO2, prevent flies into the wine/beer. Usage: 1.After adding water to the exhaust valve . 2.After both sides of the exhaust valve's water in the parallel state, gently insert the bucket lid. 3.When wine ferment generated bubbles, through the exhaust valve discharged to buckets outside , 4.All the fermentation process is in normal temperature, automatic fermentation , exhaust, without manual control. 5.Can be used -brewed beer, wine, cider and other uses. colour:White + red Material:plastic size:Length: 17cm Lower mouth diameter: 1cm Contents: 10x S-Shape Air Lock with snap-on caps Note: Please use boiled water to boil and disinfect the Air Lock you using it. And clean it with water after using. Only the above content, other are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.