Northern Brewer No. 8.5 Drilled Rubber Stopper - 37mm ID For Home Brewing Carboys & Fermenters

About This Product

Homebrewers, this Northern Brewer rubber stopper is one of those simple but essential pieces of equipment that every brewer needs in their toolkit. The number 8.5 size with 37mm inside diameter fits most standard glass and plastic carboys perfectly, creating a solid seal for your fermentation vessels. The drilled center hole is designed to accommodate airlocks, which allows CO2 to escape during fermentation while preventing oxygen and contaminants from getting in. Made from solid gum rubber, these stoppers provide a positive seal that's crucial for successful fermentation - no more worrying about leaks or oxidation ruining your batch. The dimensions (37mm ID, 45mm OD, 25mm width) are standard for the industry, and the quality is noticeably better than cheaper alternatives that might not seal as reliably. I've used these for everything from 1-gallon experimental batches to 5-gallon primary fermentations, and they've never let me down. They're easy to clean and sanitize, and they hold up well through multiple brewing cycles. Whether you're making beer, wine, mead, or any other fermented beverage, having reliable stoppers is non-negotiable for maintaining proper fermentation conditions. It's one of those basic brewing supplies that seems simple but can make or break your final product. Keep a few extras on hand - they're inexpensive insurance against fermentation problems.