Worked great. There was 2 different stickers showing the pump/extract diretion that contradict each other. The one on the screw was correct so I peeled off the one on the valve. Tested in a bottle of oil. It sucked it in or blew bubbles.I ran it at 40psi and it pumped 6 liters in about 2 minutes.It was super easy to use and makes the job so easy.There are no instructions but it's straight forward to operate. 3 steps. Open the black valve on the compressor connection to pressurize the tank. Turn the screw on the blue valve to pump or extract. Squeeze the handle to extract or pump fluid.I had no leaks and I am very happy with the tool.