In a straight roll, if the male threads are positioned on the inside, it is called what type of roll?

In a straight roll, when the male threads are positioned on the inside, it is referred to as a storage roll. This configuration helps keep the hoses protected and organized for storage, reducing the likelihood of kinking or damage when the hose is not in use. The storage roll is especially useful in fire suppression scenarios where quick deployment of hose lines is essential.

In contrast, other types of rolls have different characteristics and applications. For instance, the salvage roll is often used for quick deployment and may involve a different method of threading or orientation. The donut roll, while compact, typically may not have the same protective features as the storage roll. Lastly, the flat roll is more about creating a flat profile for easier handling and storage but does not specifically imply the internal orientation of threads required for the context of this question. Thus, the storage roll is correctly identified as the configuration with male threads on the inside.