Why were the bungs placed in the tubes?

Bungs were placed in tubes to seal them and prevent the contents from spilling or being contaminated. The airtight seal created by the bungs helps maintain the integrity of the material inside, whether it’s for storage, fermentation, or transportation. This practice is especially important in processes like brewing or winemaking, where exposure to air can spoil the product. Additionally, bungs can aid in controlling pressure buildup within the tubes.