Product detailsDetails:1. The hose that draws the liquid needs to be put into the liquid? first, then you press the black ball twice or thrice simultaneously. Otherwise there will be air entry, causing the inability to work.?2. Raise the container, containing the liquid you want to transfer above the car tank, Generator or Can where you want to transfer the liquid into3. Press the black ball twice or thrice to start transferring.3. It is reliable and easy to use4. Siphons a good quantity of liquids into your car tank, Generator or Can etc.