• Set of 3 in-line one-way check valves made of aluminum • Includes three sizes: 6mm, 8mm, and 10mm, adapting to different types of pipes • Each valve features an indicator arrow showing the correct flow direction, preventing fluid backflow and keeping it within the conduit • High-strength and hardness material, ensuring durability in use • Easy installation and replacement, suitable for automotive, marine, caravan, and agricultural applications • Compatible with gasoline, water, biodiesel, and coolant • Recommended for water pressure pumps and systems where fluid backflow needs to be prevented • Useful accessory for piping systems in vehicles, boats, and agricultural equipment