Start multiple small-batch experiments simultaneously with the 1 Gallon Glass Fermenter 4-Pack. This comprehensive kit includes four 1-gallon high-clarity flint glass carboys, four #6.5 drilled rubber stoppers, and four twin-bubble airlocks. Perfect for homebrewers, winemakers, and mead makers, this kit allows you to test different yeast strains, fruit additions, or dry-hop profiles in manageable 1-gallon increments. The glass construction is 100% flavor-neutral and exceptionally easy to sanitize for professional-grade results.