Start multiple small-batch experiments simultaneously with this 5-Pack Fermentation Hardware Set. This comprehensive kit includes five high-clarity 3-piece airlocks and five #6.5 drilled rubber stoppers, specifically sized to fit standard 1-gallon glass jugs and small-mouth carboys. The 3-piece airlock design allows for easy disassembly and deep cleaning, making it the professional choice for active primary fermentations. Providing a 100% airtight seal, it protects your beer, wine, or kombucha from oxygen and airborne contaminants.