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Hold the two ends of the tube in one hand, and continuously pinch the black suction airbag in the other hand to identify the one that is blown out by the air.This head is the oil outlet, and the one that is not blown by the gas is the oil inlet.Put the oil inlet into the fuel tank of the car, put the oil outlet into the oil tank, and control the distance between the pipe and the height difference between the oil inlet and the oil outlet.Saltwater and caustic liquids are not recommended.You must pour into a bucket that is higher than the liquid you are draining.In the container, not on the surface, keep the hose.Only applies to automobiles without a oil protection net.Saltwater and caustic liquids are not recommended.You must pour into a bucket that is higher than the liquid you are draining.In the container, not on the surface, keep the hose.Only applies to automobiles without a oil protection net.