Quality material: light weight alloy and rubber, high quality rubber and aluminum alloy, made of high quality rubber and metal, corrosion resistant, oil resistant, durable, wear resistant, difficult to tear and long service life. Excellent design: Thickened design with double-sealed fasteners for better sealing. Large glowing shape ensures high suction power and accelerates oil pumping. Ingested with low-pressure material. permeation to prevent fuel evaporation, to maintain flexibility and prevent collapse in hot and cold weather. The connector is designed to facilitate the installation of the casing tube and will not fall off. Wide application：Suitable for helicopters, ships, motorcycles and others fuel systems, suitable for carburetor and low pressure fuel systems Metal valves Size: 8mm (5/16") Body size: 154 x 46mm / 6.06 x 1.81in Package includes: 2 x Rubber Petrol Petrol Petrol Diesel Pump Black (8mm) One-way check valves are essential devices in many applications to control flow of fluids in a unidirectional manner, preventing unwanted returns and ensuring the safety and efficiency of the systems in which they are used. They are available in a variety of designs and sizes to meet the specific needs of each application. Our Service: We are committed to providing you with satisfactory service. If you have any questions, you can contact us at any time. We will reply to you within 24 hours and try our best to resolve the problem for you.