Coolant Reserve System Radiator cap

There is only one line from rad to bottle so the cap either works or doesnt.
Cap doesnt control which hose coolant runs thru. Thats controled by where inside the bottle the lines open end is located.
Low for dump/pick up, higher for overflow/dumping on ground.
I'd swap the two lines on the overflow tank.
Later tanks have the "puke line" molded in so theres no confusing the two.