PREMIUM MATERIALS: The fermentation cap kits are made of durable stainless steel caps and high-grade plastic that are , making the fermentation caps a stylish addition to kitchen compatible accessories, and each fermentation cap is perfect for better drawn air from the bottle. Good Sealed Preservation: The jar lid features a leak-proof gasket made of built to last food-grade silicone to.Vacuum cap air valve, pump out the air in the bottle, make the bottle in a vacuum state, will not leak, safe and reusable. EASY TO USE AND STORAGE: Our fermenter lid kit with hose is compatible with FoodSaver's seamers. The hose should only be used with the FoodSaver Vacuum Sealer. It is small and easy to store when not in use. You'll get the sleekest and easiest fermentation system ever made with lids that make fermentation easy, food-stocking compatible fermentation lid kits for better gas escape, and matching pull tabs to help you open jars, too easy You will get 6 sets of fermentation caps compatible with food protectors (4 attachments 1 hose) to help your items get air out of the jars. Stainless Steel Lid Split Type with Vacuum Valve with Leak-Proof and Air-Tight Seal for Food Storage/Fermentation/Freshness,fermenting lids ziHenryDa Vacuum Seal Lid Accessory Hose Compatible with FoodSaver Vacuum Sealer, Mason Jar Vacuum Lid 6PCS Stainless Steel Lid Split Type with Vacuum Valve with Leak-Proof and Air-Tight Seal for Food Storage/Fermentation/Freshness (86mm)