Pickle Pipe - One-Piece Silicone Waterless Fermentation Airlock Lids for Mason Jar Fermentation - Regular Mouth - 4 Pack 4 SMALL MOUTH PICKLE PIPES INCLUDED - (red, teal, purple, blue) which work with any regular mouth mason jar such as Ball, Kerr, Bernardin and more. FITS JARS WITH 2 3/4 (70 mm) OPENING One-piece silicone waterless airlock eliminates risk of mold without any daily maintenance. Vents gases and prevents oxygen exposure automatically. BPA-free, food-grade silicone is dishwasher safe and reusable for many years. Low profile design lets you ferment in small spaces. No need to burp jars, maintain water levels in your airlock, or keep track of complicated airlock systems with multiple pieces. Just screw onto any SMALL mouth mason jar, and the Pickle Pipe will do the rest. The only true one-piece set and forget waterless airlock that just works. Pack a Mason jar with veggies, brine and keep veggies submerged below brine Screw on a Pickle Pipe with Mason jar band and leave in a dark, cool place Thats it! The Pickle Pipe will automatically vent your ferment Enjoy the freedom to &#034;set and forget&#034; your ferment for days, or even weeks Fermenting vegetables create carbon dioxide; it must be vented or the hosting jar may explode Open air will expose the food to oxygen, promoting mold growth Pickle Pipes automatically release CO2 without allowing in any oxygen Pipe Pipes are the only one-piece silicone airlock tool that requires no daily maintenance No worries of rust from stainless steel plated products or toxins from cheap plastics with our food safe and BPA-free silicone