4 Pack Mason Jar Fermentation Lids - Airlock Fermentation Pickle Pipes Fermenter The Mason Jar Fermentation kit includes 4 water free fermentation caps, free of bisphenol A. 4 colors make your kitchen colorful.Suitable for wide mouthed Mason bottles. Ifyou have more purchasing needs。These premium quality self burping ferment caps have a one way waterless valve to vent gas automatically while home fermenting vegetables. This simple one-piece airlock requires no water, burping or maintenance.Gas is produced during the fermentation process of food. Gas can be discharged from the top of the lid, while external air will not enter inside. This ensures that the food will not spoil. Made of high-quality silicone, with a long service life.Sauerkraut fermentation is a very interesting family experiment. The fermentation process of vegetables will produce probiotics. You can take your baby with you DIY. Shipping We offer FREE shipping on all orders! We ship within Three business days of payment, usually sooner. We use a selection of shipping services such as UPS, FedEx, USPS etc. We only ship to the lower 48 states, no APO/FPO addresses or PO Boxes allowed. Local pickups and combined shipping options are not provided at this time. Return You can return a product for up to 30 days from the date you purchased it. Any product you return must be in the same condition you received it and in the original packaging. Please keep the receipt. Customer satisfaction is very important to us. If you have any problem with your order, please contact us and we will do our best to make you satisfied. Contact Us If you have any queries, please contact us via ebay. We usually respond within 24 hours on weekdays. Please visit our eBay store to check out other items for sale! Thank you for shopping at our store.