|Product photo from Adafruit.com (don't sue me)|
This is a great little pump! It's positive displacement and self priming. The best part is, it's reversible!
In the vid, we use this pump to actuate a syringe plunger back and forth.
Out of the box it'll provide 1.3 Bar of pressure (19 PSI for our American friends). We used hook-up wire to clamp the tiny tubes and got it up to 1.8 Bar (26 PSI). On a 1" diameter syringe (a big one) that's enough pressure to lift nearly 10 kg!!!!
Arduino controlled hydraulic robot anyone?