Coolant tank - why so many baffles inside it? (refill rant)

[erikv11]

what is the box in front of the coolant tank? The connector in the rear is detached so its sucking or blowing atmospheric air somewhere.

...

That's the ECU box; there is also a TCU in there. That duct hole/duct (duct is missing on your car) exhausts the cabin air that is used to cool the ECU and TCU. Might want to reinstate it e.g. from a junkyard item if you can find it.

[850forum]

I can't recall on an 850 or 98 V/S/C70. I seem to recall it has a stupid tang on it you have to figure out how to move inward to the bottle body to remove it, and by sliding the bottle upward on the slider channels.
Neil.

Yea that's what it looks like. Now if I can also remove that air handling box to the front, I can get to the stupid windshield washer filter - the tube on the bottom requires some access to pull off & especially to replace. Why does it have TWO tube out the top, that are just vented? I can understand one so the piston can move, but two ?