6/8/10/12mm Aluminum One-way Non-return Check Valve for Fuel, Water, Gas, and Air Vacuum SystemsThe smallest size of these one-way valves is 6 mm, and the largest size is 12 mm. These valves prevent fuel from flowing back to the tank and maintain fuel in the line, allowing for easier installation and secure fitting.Features: - Aluminum head provides longer service life compared to plastic heads - Arrow marking indicates fluid flow direction - Prevents fuel from returning to the tank, helping to solve hard or slow engine start issues caused by fuel drainback - Suitable for use with water pressure pumps and galley pumps that are not self-priming - Professional-grade non-return valve ideal for marine, automotive, caravan/RV, and agricultural applications - Stable performance and high reliability - Easy to install and replace Specifications: - Material: Aluminum alloy - Product sizes: 6 mm, 8 mm, 10 mm, 12 mm - Weight: 6 mm: 19g, 8 mm: 21.1g, 10 mm: 20.6g, 12 mm: 23.5g - Compatible with diesel, gasoline, and water; resistant to aging - Opening pressure: 0.2 bar - Working pressure range: 0.26 bar - Operating temperature range: -30C to 130C - Applications: Cars, boats, helicopters, motorcycles, and other fuel systems - Media: Diesel, gasoline, water, and similar non-corrosive fluids - Not suitable for methanol, as methanol can produce formic acid that may corrode internal components and cause failure Package Included: 1 x Fuel Non-return Check Valve Note: - Slight variations in measurements may occur due to manual measurement - Color may vary slightly due to monitor calibration differences; actual product appearance may differ slightly from images