Premium solid black tapered bung cork made from high-density natural rubber for superior elasticity and airtight sealing. Precision-molded conical design ensures perfect fit for 3/4" openings with friction-lock technology. Chemical-resistant formulation withstands acids, alcohols and solvents in laboratory/industrial use. Dual-purpose functionality for home brewing carboys and scientific glassware applications. UV-stabilized material prevents cracking in outdoor storage conditions. Non-porous surface inhibits bacterial growth for food-safe liquid containment. Beveled edges facilitate effortless insertion/removal without tool requirement. Optimized taper angle creates progressive compression for leakproof performance. Bulk packaged in recyclable PET containers with 500-unit quantity discounts available.