If you have a Zerowater dispenser system, then you know this button for the tap. It's fine if you just want a small cup of water, but if you say, need to fill a 4L jug, your thumb is going to be numb by the end.

This is where my Zerowater tap button presser comes in!

It converts the button press tap to a screw driven tap. You screw it in to get water, unscrew it to stop. Save your fingers!