Professional grade non-return valve - ideal for marine, automotive, caravans/RV, and agriculture. Stable characteristics, high reliability. Arrow marked on valve, showing fluid flow direction, prevents fuel from returning back to the tank and keeps it in the line. Easy installation and replacement. Suitable for: diesel, gasoline, water, etc. (Not applicable to methanol) Specification: Exterior material: Aluminum Alloy Interior material: Opening pressure: 0.2 bar Operating pressure: 0.2-6 bar Operating temperature: -30 C - 130 C Size Chart: Size: (approx.) Diameter: 6mm/0.24inch ; Length: 60mm/2.36inch Package Includes: 1 Piece Non-return Check Valve Note: This Fuel Non-return/One Way Valve cannot be used in methyl alcohol, because formic acid will be produced while it is powered on, which will to the uselessness.