Step Aluminium Inline Straight Check Valve Fuel Diesel Gas Liquid Air One Way Non Return (6mm) Features: 1. The life of aluminum head for using is longer than plastic heads. 2. Arrow marked on valve, showing fluid flow direction, Prevents fuel from returning back to the tank and keeps it in the line. 3. Also great for water pressure pumps & galley pumps which are not self-priming. 4. Professional grade non-return valve - Ideal for marine, automotive, caravans/RV, and agriculture. 5. Stable characteristics, high reliability. 6. Easy installation and replacement. Specification: Product name: One-way Non-return Valve Condition: New Color: Silver Construction: Aluminium Valve Opening (Cracking) Pressure: 1.5psi Operating Pressure Range: 1.5psi to 65psi Max backpressure: 72psi Optional Diameter of Cylinder:  6mm/0.24in, 8mm/0.32in, 10mm/0.39in, 12mm/ 0.47in   Fitment: Universal Suitable for use with petrol, diesel, biodiesel, water, coolant, oil, air/vacuum. Package List: 1 * Check Valve