The unit of filling hose

It is either imperial size or metric millimeters. In the medical equipment industry, common sizes of fluid-filled hoses include 3/16 inch, 1/4 inch, 3/8 inch, etc., while in the industrial sector, some common sizes of fluid-filled hoses are 6 mm, 8 mm, 10 mm, etc. The size of the liquid filling hose is not only related to its diameter size, but also related to wall thickness, material and other factors.