Drilled Carboy Bung - Large
This universal bung is made of rubber and is tapered longer than the average bung to create a better seal. The top is 2 3/8" in diameter, and the bottom is 1 7/8" in diameter. The lip around the top is designed to keep the bung from falling in, and you can use the hole for an airlock. Measuring your carboy opening before purchasing a bung is a best practice.