Multiple sizes available: Our one-way fuel check valve comes in a pack of 4 valves of different sizes, 1/4 inch, 5/16 inch, 3/8 inch, 1/2 inch, to meet your various needs need; Perfect OPERATING PRESSURE AND TEMPERATURE: This 3/8 check valve not only withstands high pressure conditions of approximately 2.9-87 psi (0.2-6 bar), but also operates efficiently at high cracking pressure temperatures of approximately -30 degrees Celsius - 130 degrees Celsius , suitable for various vacuum system operating environments. High-quality materials ensure durability: The one-way valve is made of high-quality aluminum alloy, and the surface is anodized to ensure its corrosion resistance and extended service life. Its sturdy characteristics ensure that it can withstand high working pressure and is suitable for various fluids One-way check valve design and non-return function: This diesel fuel check valve adopts a one-way check valve design to ensure that liquid flows in only one direction, providing unparalleled efficiency; the non-return function adds another dimension to your fluid system management A layer of control. Easy to install and replace: The one-way check valve provides easy installation and replacement, making it a worry-free addition to the machine; Material: Aluminum alloy colour: black Package Contents: 1 set x fuel line check valves (4-pack) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.