Answer:
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
There's one in every deck of cards and in a famous movie
Cold head and feet; Round as a ball; Always turning around itself.
What is so delicate that even mentioning it breaks it?
What tire doesn’t move when a car turns right?
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?