Internal pipe in reservior

[Merecol]

Hi guys.I have seen a lot of reservior with an internal pipe.I don't understand the utility of these pipes...Can you explain me?

 

[Mr.Scott]

Anti-vortex
It basically keeps the fluid motion in the res calm. Calm liquid = less bubbles

 

[caddi daddi]

that, and it keeps the return fluid from being sucked directly back out to the pump allowing any air bubbles to escape.

 

[GTXJackBauer]

Anti-vortex
It basically keeps the fluid motion in the res calm. Calm liquid = less bubbles

that, and it keeps the return fluid from being sucked directly back out to the pump allowing any air bubbles to escape.

This.