
Air Compressor Hose & Tube Guide - What Size? Air Tube
21/4/2021· The ‘H’ in H.I.D. stands for HOSE. The ‘I.D.” in HID stands for the hose “inner diameter”. Hose size is measured by its inner diameter. A 3/8″ hose will have a hole in the center that is exactly 3/8″ in diameter regardless of how the outer diameter of the hose varies. And it does, depending on the type of hose and the manufacturer.