Package includes: you will receive 10 pieces of silicone grommets and 5 pieces plastic airlocks, enough compatible with your and replacementReliable material: these airlocks are made of pp plastic, the airlock grommets are made of silicone, durable and soft, safe compatible with your , can serve compatible with a long time Keep good seal: easy to , just drill a suitable hold on your fermenter lid ( the size of valve), then the black grommet insert into the lid hole, place the tapered tip of the airlock into the grommet hole to make a good sealConvenient to clean: easy to clean with practical design, the airlock can be disassembled, just a small brush to make it clean completely, it can soak in bleach water to disinfectMain function: the airlock kit serve as versatile fermenting equipment, compatible with a variety of purposes, such as preserve foods, ferment of cabbage, pickles, sauerkraut, grape and so on, or making beer, wine, meadsize:Seal ring inner diameter: 8mmMaterial:Plastic + Siliconecolour:As ShownPackage Contents:5 x Three-piece check valve 11.5cm10 x seal ringOnly the above package content, other products 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.