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 it
Squeeze 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.
 
Package:
1 * Car Fuel Gas Pump