Multiple sizes available: Our one-way fuel check valve comes in of 4 valves of different sizes, 1/4 inch, 5/16 inch, 3/8 inch, 1/2 inch, to meet your 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 vacuum system operating environments. High-quality materials durability: -way valve is made of high-quality aluminum alloy, and the is anodized to its resistance and extended service life. Its sturdy characteristics that it can withstand high working pressure and is suitable for fluids One-way check valve design and non-return function: This fuel check valve adopts a one-way check valve design to that liquid flows in only , providing unparalleled efficiency; the non-return function adds another dimension to your fluid system management A layer of control. Easy to install and replace: -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.