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Product Description Aluminum Alloy Fuel Non Return Check Valve One Way Petrol Diesel 6/8/10/12mm Specifications:Material: aluminum alloy Product size: 6MM 8MM 10MM 12MM(Optional) Advantages: diesel, gasoline, agingresistance Opening pressure: 0.2 bar Working pressure range: 0.2-6 bar Working temperature range: - 30 ? to 130 ? Scope of application: car, ship,helicopter, ship, motorcycle and other fuel systems Package Content: 3 Pcs Aluminum Alloy Fuel Non Return Check Valve One Way Petrol Diesel +with 6Pcs Universal Adjustable Hose Clamps Kindly Tip: 1. Conversion: 1 inch 2.54cm Size Approximately : These size is about Asian Size,general get one size smaller than US/EU size,Please reference to the size chart in the picture. Item Measure by hand, it could be 1-3cm different. hope you can understanding, will be sincerely appreciated. 2 .Please be reminded that due lighting effects, monitors brightness/ contrast settings etc, there could be some slight differences in the color tone of the websites photo and the actual item.