主权项 |
1. A bottle comprising:
a body, being of a cylindrical shape, having a mouth and a bottom end, wherein the bottom end is open and provided with an inner thread; a ball bung, received in the body for sealing the mouth; and a bottom assembly comprising:
a base, being a disk;a post, axially connected on the base, an outer thread being formed on a cylindroid thereof for screwing with the inner thread; anda piston, axially connected atop the cylinder, fitting snugly into the body to form a gastight status. |