At what nominal speed at 5V ?

If you need a suction pump that runs for a long time, we recommend that you use this type of water pump.
https://www.dfrobot.com/pro...

We're sorry, we don't have that information.
If you want to integrate this Pump in a food-grade item, we don't recommend it. This is because this Pump is not food grade internally.

hi. Nice Product! i just wanted u guys to know. in case u need more pressure (vacum) u can stack those in series. i tryed it with 4 pumps and achieved a pressure of about 3.3 -3.4 bar / 0.33 - 0.35 Mpa. @5v.

:)

Do I need a flyback diode or freewheeling diode when I use it with an Arduino?