What does “ID” refer to in hose specifications?

In hose specifications, the term "ID" stands for Inner Diameter. This measurement is crucial because it refers to the interior width of the hose, which directly affects the flow capacity of the fluid being transported through the hose. Understanding the inner diameter is essential for selecting the appropriate hose for specific applications, as it influences both the required flow rate and the pressure within the system.

Other terms like Interchangeable Diameter, Imperial Dimension, and Independent Drive do not have a recognized meaning in the context of hose specifications related to fluid lines and fittings. For example, Interchangeable Diameter may imply compatibility features but does not specifically describe a measurable characteristic of the hose itself. Similarly, Imperial Dimension and Independent Drive are unrelated to the physical properties of hoses and fittings, further emphasizing that Inner Diameter is the correct and relevant definition in this scenario.