They are not probably not important for your application.
The Vce 40 is the most important for hobbyists.
For example, if the water pump is 24V, this is less than the breakdown 40V.
Of importance is, maximum current, VCEsat and power rating.
However, suggest you use a logic level MOS FET rather than a BJT.
What exactly are you trying to do?
What is the pump's ratings?
What power supply do you have for the pump?
Show us a good schematic of your circuit.
Show us a good image of your wiring.
Give links to components.
Posting images:
https://forum.arduino.cc/index.php?topic=519037.0