Which size fire hose does an S-type use for its supply?

The S-type fire hose typically uses a supply size of 2.5 inches. This size is ideal for various applications as it provides a good balance between flow rate and pressure, making it effective for delivering water in fire suppression scenarios. The 2.5-inch hose is versatile, commonly used for feed lines and is capable of supplying sufficient water to both hand lines and larger attack lines.

While hoses of different diameters, such as 1.5 inch or 3 inch, are often used for specific purposes—like smaller handlines or larger supply lines respectively—they do not match the specifications required for the S-type's performance needs. A 4 inch hose is generally not associated with the S-type as it is utilized in more specialized industrial or high-volume applications. Thus, the correct size for an S-type fire hose is, indeed, 2.5 inches.