i consider those 2'' diameter tanks more of a puke tank than an actual coolant recovery/fill tank
i made mine out of 3'' ss exhaust tubing about 14'' long with no way to check the level. it holds about 1.5 quarts.
i just fill the radiator to the top when the coolant is cool, any radiator that is full will burp fluid out as it gets warm.
when the engine warms up it will burp out any expansion fluid and when it cools down it should suck everything back into the tank.
i'm under my hood often enough to keep an eye on the radiator level
3'' 304 ss tube. capped on both ends. fill drain fitting near bottom. vent tube welded in bottom is cut at an angle and run to the top of the tank.