This hose is used by manufacturers of American refrigerators, reverse osmosis systems or water purifiers.
It is used to connect the appliances to the water supply.
The outer diameter of the hose is 6.35mm or 1/4" inch.
It is suitable for all standard reverse osmosis systems. It is also suitable for all refrigerators that have an external water supply.
It is advisable to change it regularly as deposits or germs may form in it over time.