HASSLE FREE WATERLESS AIRLOCK VALVE IS SO EASY; our no burp value automatically allows gases to escape and prevents oxygen from entering which means no burping of lids is needed; the waterless airlock fermentation lids are low profile which means no more bulky water filled airlocks so the jars fit easily into cupboards; fill a widemouth mason jar with vegetables and brine and screw on the lid; it’s that easy COMFORTABLE EASY GRIP TABS; no more sore hands as we carefully designed our lids with 4 ergonomically designed tabs which allow easy opening when your fermented vegetable is done; you will enjoy the comfortable rounded upper edges on the entire lid which make this the most comfortable to use mason jar fermentation lid FERMENTATION LID KIT WITH OXYGEN EXTRACTOR PUMP; our fermentation jar lids are made of the highest quality durable BPA free plastic with automatic valve and reliable gasket providing you with a perfect lacto ferment every time so you can fill your wide mouth mason jar then set the date; no need to use pickling crock pots or other fermentors as these fermentation airlock lids do the work for you SIMPLIFIED DATE TRACKER; date setter ring is easy to set and remembers the date for you removing the need for date stickers; get a perfect probiotic rich culture and lacto ferment every time with sauerkraut kombucha kimchi kefir pickle cabbage or any fermented food or vegetable; the perfect starter pickler kit 100% SATISFACTION GUARANTEE; our easy grip mason jar fermenting lids are backed by our manufacturer 30 day money back guarantee and 1 year free replacement warranty to assure your satisfaction