Final answer:
Closed-head drums typically have bungs of 2 inches, but may also have a secondary size of 3/4 inch for different applications.
Step-by-step explanation:
Closed-head drums, commonly used for storing and transporting liquids and other materials, usually have standard-sized openings known as bungs. The typical sizes for these bungs are either 2 inch or 3/4 inch. These sizes allow for the use of pumps or for the pouring of contents, while maintaining a secure closure to prevent leaks or contamination. It's important to note that while 2 inches is a common bung size, the exact specification can vary depending on the manufacturer and the intended use of the drum.
Closed-head drums usually have bungs of various sizes depending on the specific drum and its intended purpose. However, a common bung size for closed-head drums is 2 inches.