What is the normal length of a tapered plug?

The normal length of a tapered plug is commonly recognized to be 3 inches. This standardized length is utilized in various applications, ensuring that the plug can adequately engage with and seal different types of fittings while also providing a reliable grip. The design and length of the tapered plug are intended to allow for an efficient and effective seal, reducing the chance of leaks and ensuring proper functionality in the systems where they are employed.

In contrast, the other lengths mentioned might not align with standard practices or could potentially cause compatibility issues in certain systems. For example, a 2-inch plug may not provide enough engagement for reliable sealing, while lengths of 4 inches or 5 inches could be excessive for typical applications, leading to unnecessary complexity or difficulty in handling. Thus, the 3-inch length represents a balance between functionality and practicality in the use of tapered plugs.