What does the dash number associated with hose signify?

The dash number associated with a hose signifies its size, specifically the inner diameter of the hose. This system of designation typically uses a standard measurement format where the dash number indicates the size in sixteenths of an inch. For instance, a hose marked with -4 would have an inner diameter of 1/4 inch, while a hose marked with -8 would have an inner diameter of 1/2 inch. Understanding this designation is crucial in selecting the appropriate hose for specific fluid transport applications, ensuring the compatibility between the hose and fittings, and optimizing flow characteristics within fluid systems. The other options do not accurately represent the purpose of the dash number, which is solely focused on conveying size information relevant to the hose.