Valve

The conductor adjusted the valve to control the steam pressure in the locomotive.

The researcher studied the functioning of the respiratory valve in insects.

The researcher examined the valve in the insect's respiratory system to understand its breathing mechanism.

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

The player used the valve to open the secret passage in the video game.

The player turned the valve to open the door and proceed to the next level.