Accelerate seal well and save effort, thicker 20mm diameter, faster flow rate and double stop valve oil pump, pumping only takes 5 seconds*Double check valve design, faster flow rate, good operation of two-way check valve, quick oil output*Increase the oil-resistant rubber sphere to absorb more water and fine grain design, anti-slip and anti-aging*Thickened PVC pipe has long service life*A variety of models are applicable, trucks, cars, motorcycles and other models can be used*Instructions for use:The correct way to use the suction pump is to stretch a tube into the liquid you need to pump, and first force itSqueeze the flat rubber ball to expel the air, then immediately block the outlet of the tube with your thumb, release the rubber ball, etc.The ball slowly swells and recovers. After the liquid is pumped up to fill the rubber ball, the thumb blocking the outlet is loosened. Repeated operation 1-2 times will form a continuous self-flow.This oil pump needs to rely on the pressure of air to achieve self-flow, because the inner diameter of the pipe is small and the flow rate is relatively slow.Directions are used from top to bottom. When using, keep the position of the rubber ball as low as possible.Specifications:Frequently used as a hand pump in boats for fuel supply to the out-board engine.Fast and Easy handling.Works on the vacuum principle.For Transfer of Liquids as Gasoline, Diesel, Oil, Water etc.Material: PVC, Rubber, Copper. Quantity: 2 * pipes, 1 *pumpPipe length: 1.5 M/2MOptionalPipe diameter: 16mm inner diameter, 20mm outer diameterPackage Included:1*Oil Transfer Pump Kit