Valve

The snail's shell had a tiny valve that allowed it to control the amount of water inside.

The professional cinematographer knew exactly how to manipulate the valve for different lighting effects.

The documentary filmmaker relied on the precise calibration of the valve to capture the natural lighting conditions.

The astronaut closed the valve on her spacesuit to maintain proper oxygen levels.

The scientist's groundbreaking research led to the development of a prototype valve that promised revolutionary advances in faster-than-light travel.