Application:Pure fermentation, such as white wine fermentation, red wine secondary fermentation,preventing back- into the fermentation 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 brewing bucket lid. 3.When wine ferment generated , 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 Package Contents: 10x S-Shape Air Lock with snap-on caps Note: use boiled water to boil and disinfect the Air Lock you using it. And clean it with water after using. Only the above package content, other products are not included. Note: Light 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.