13mm 1/2" multi-purpose fuel oil pipe is a type of flexible hose that is commonly used for transporting various types of fuels, such as diesel, gasoline, and oil. The hose has a 13mm internal diameter and a 1/2" outer diameter, making it suitable for use with a wide range of fuel fittings. The hose is typically made from a combination of rubber and reinforced synthetic fibers, which provides it with good flexibility and strength. It is also often reinforced with metal or plastic wire to further enhance its durability and resistance to punctures or leaks. The multi-purpose design of the hose means that it can be used in a variety of applications, including automotive, marine, and industrial settings.