a tube slightly larger than u wiener that you put ur wiener in and pump the air out of which expands your dick.
He had a small wiener so he bought a penis pump to enlarge it.
He had a Huge wiener so be bought a penis pump to make it even bigger.
Like a jockstrap, but its not for your dick just your balls. Your nuts are held in place and your dick flops over the top.
For example, Zach slipped on his supporter before the game.