Main materialThe household beer lock is made of high quality PP plastic, which is environmentally friendly, harmless and safer. Meanwhile, the grommets of the airlock are made of silicone, which is durable and soft. [Easy to use] Just poke a suitable handle on the lid of the fermenter, fill the airlock of the fermenter with water and place it on the lid of the infuser, then use the insert to insert the black nozzle through the hole in the lid and the cap. Block the hole with the airlock. Home brew locks can be reused for a long time. Advantages All parts are detachable, so easy to clean, can be washed with detergent and water. It can effectively isolate air and prevent oxidation, so that the whole fermentation process can be automatically fermented and exhausted at room temperature. [Package] You can get 4 plastic airlocks and 8 black silicone grommets, the quantity is enough for you to use and replace. The airlock is 11.5cm high and 4cm in diameter. Wide ApplicationAs a multifunctional fermentation equipment, the airlock kit is suitable for stainless steel fermentation tanks. For canning, cabbage, pickles, sauerkraut, grape juice, brewing beer, wine.