The Kombucha Company 38‑400 Ribbed Polypropylene Screw Caps with Food‑Grade Foam Liner – fits Most ½‑Gallon & 1 Gallon Growlers, Jugs, F-Style Containers (12, Black)

The Kombucha Company Black Polypropylene Screw Cap with Foam Liner, 28-400 Size, Fits Many 16oz Bottles Including Boston Rounds, Good for Kombucha, Beer, Juice, Pack of 6 (Bottles Not Included)

• Universal 38‑400 Fit: Compatible with most ½‑gallon to 1‑gallon glass growlers and jugs with 38 mm neck diameter. Thread finish: 400 continuous thread.
• Secure Foam Liner Seal: Each cap includes a PE foam liner to preserve carbonation, prevent leaks, and keep your beverage fresh.
• Ribbed Sides for Easy Grip: The ribbed outer skirt enables easy opening, even on wet or slick surfaces—ideal for kombucha, kefir, cold brew, juice, vinegar, and more.
• Pack of 6 – Value Set: Enough caps for multiple batches or backups; perfect for home brewers, small brands, and bulk bottling operations.