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Precision Fit for PET: Specifically tapered to fit the unique neck of Better Bottle and other PET plastic carboys without slipping or popping out under pressure
allowing you to dial in the exact level of pressure needed for a custom seal
ensuring no chemical migration or off-flavors
FOOD SAFE MATERIALS: These wine bottle stoppers are made of food-grade silicone
Ventilating: Acts as a built-in airlock
Tall Traditional Silicone Barrel Bungs - 10 Pack Value Bundle | Solid White Universal Fit for 60/53 Gallon (225/200L) Barrels bung Precision Fit for PET: SpecificallySolid White 2 3 16" Bung Value Pack of 10 Our Tall Traditional Silicone Bung is the reliable choice for long term barrel maturation. Designed specifically for the standard 2 3 16" (55. 5mm) top diameter opening, this bung provides a deep, tapered fit that ensures an airtight seal against oxidation. Use this solid bung after fermentation and filtration are complete to protect your wine or spirits during the critical aging phase. Airtight Security: The