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Tired of flimsy caps that lose pressure and ruin your fermentations? Our single Black Polyseal Cap is the ultimate upgrade for your standard glass growlers and jugs. Built from rugged phenolic plastic, this cap features a clever, built-in conical liner that wedges itself directly into the bottle's neck as you twist it shut. It creates an incredibly tight, dual-action seal that locks in high carbonation and keeps oxygen completely out.
Standard foam-lined caps quickly degrade, harbor mold, and lose their seal over time. Our Polyseal caps solve this problem by eliminating the traditional flat liner entirely. The heavy-duty plastic cone is designed to compress and conform to the glass imperfections of your bottle neck. It is the perfect, highly reusable closure for homebrewers, fermenters, and makers who demand a reliable, airtight barrier.
Carbonation-Locking Design: The conical liner forms a high-pressure seal, making it ideal for holding carbonation in kombucha, cider, and beer.
Molded Conical Liner: The LDPE plastic cone is molded directly into the cap, meaning it will never fall out, tear, or trap bacteria.
Rigid Phenolic Shell: Constructed from high-density phenolic plastic that resists cracking and stripping, even when tightened firmly.
Acid & Oil Resistant: Highly resistant to aggressive liquids, essential oils, vinegars, and alcohol, ensuring it won't corrode.
Textured Easy-Twist Ridge: Designed with distinct vertical ridges along the rim to give you maximum grip and leverage when sealing or opening.
Bottle Size / Capacity: Fits standard 38-400 thread finishes (commonly found on 1/2 gallon and 1-gallon glass jugs)
Wholesale Pack Quantity: Single Cap
Color: Black
Others: Food-grade LDPE liner, BPA-free, fully washable and reusable.
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Shipping costs can vary, and we want to get you the best rate possible. Before placing your order, reach out to our team so we can personally arrange your delivery and apply any available shipping discounts.
