Mason jars are the perfect vessel to ferment in: easy to find, fit perfectly in kitchen cupboards, dishwasher safe, and versatile. Our patented Pickle Pipe airlocks are the easiest way to vent fermentation gas. The one-way valve automatically releases gas, without letting in any oxygen that can cause spoilage. This means no more having to regularly monitor and manually burp your jars during fermentation. We recommend using this product with food-safe glass fermentation weights.