Product Information:This siphon pump can quickly and easily transfer fuel, water or other liquids from one container to another. Frequently used as a hand pump in boats for fuel supply to the out-board engine. Easily operation, with this hand pump you can prime the fuel for easier start. Works on the vacuum principle, fast and easy handling. Easy to clean. With flexible PVC hose in each side, pure copper interface, durable and oil-proof. Specification: Material: PVC + Copper + Rubber Color: Black + Transparent Color Diameter: 8mm/0.31" How to Use: Make one end head of the tube into the needed to extract liquid, firstly, pinch flat rubber ball forcedly to vent the air, then blocked the export of the pipe with fingers, and release the rubber ball, wait until the spheres bulging recovery slowly, and when the liquid was pumping up to fill fully the rubber ball, you can release the fingers, and repeat one or two times of this operations, it will form a continuous gravity. Package Included: 1 x Hand Pump，A hose. Note: Due to manual measurement and optical fiber, 1-3cm error and small color difference are allowed, please refer to the actual object.