NZ, Thats's the same one that I have in front of my Battery. What's that in front of yours? I can't quite make it out.
Chevyvert, Any type of liquid holder that has it's input line below the liquid will be a coolant recovery bottle. When the radiator and engine "cool" A powerful vacuum is created in that space that will suck anything back into that hose. If you see a container that has a bottom feed, it'll work. If you see a hose on top, it's usually for the overflow. If you see a container with one hose on top, the hose has to extend down to the bottom and those types either have a hole at the top or another hose to vent and allow air in.
Rob