Feature: 1. One Way Check Valve Design for inhibiting backflow in a line, arrow marked on valve, showing fluid flow direction. 2. Made of aluminum alloy, high performance and anti-corrosion, suitable for water, petrol, diesel, oil, and other fluids. (not applicable to methanol). 3. Ideal fuel check valve for carburetor and low-pressure fuel systems of cars, ships, helicopters, ships, motorcycles and others. 4. Easy to install and replace, just according to the little arrow on the valve, connect the fuel line. can make the pipes don't drop off with some hose clamps Specification: Material: High Quality Aluminum Color: Like the picture show Quantity: 1 pc Size: 6mm,8mm,10mm,12mm Function: prevents fuel from returning back to the tank and keeps it in the line. Fitment: Fit for Carburettor and low pressure fuel systems