The Pickle Pipe is a patented silicone fermentation airlock made of one simple piece that sits on the mouth of wide Mouth Mason jars and is secured with a common screw band. It automatically releases CO2 through a one-way valve to ensure your jars don’t explode from fermentation gasses, without letting in any oxygen that can cause spoilage. Easily ferment virtually any vegetable in wide mouth Mason jars with Pickle Pipes, including sauerkraut, kimchi, and pickles, right in your own kitchen. Each pack includes 4 wide mouth Pickle Pipes made of BPA-free, phthalates-free and food-safe silicone, and access to a free recipe e-book with step-by-step instructions.