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Check valves are mechanical valves that permit liquids(like fuel, water, oil) to flow in only one direction, preventing process flow from reversing. They are classified as one-way directional valves. Fluid flow in the desired direction opens the valve, while backflow forces the valve closed. The mechanics of check valve operation are not complicated. And our Bang4buck check valves are made of Aluminum which has much longer using life with very considerable price! Specifications: Material: Aluminum Alloy Suits: 8mm (5/16") ID hose Overall Length: 60mm Hex size: 22MM Hexagonal Length: 21mm Compatible: Suitable for water, petrol, diesel, oils, and other fluids Item included: One way check valve x 1 Please note: There might be a 1-2mm error on the basis of different measuring methods, it is in normal range. Pls measure the size before purchase ****NOTE:the item will be shipped from overseas because of out of stock in IL warehouse but it will be delivered by the delivery time as the order shows. If you need it urgently, please kindly choose expedited shipping way. Thanks!