This is a Pipe.

Pipes are what gets any fluid from one place to another. Pipes are consisted of 3 parts: The Nozzle, the Entrance, and the Pipeline. Sometimes the Nozzle can have a wheel attached to it. When this happens then there will be no Entrance and you must touch it for a certain fluid to be released. The fluid is determined by the color of the Wheel.

Blue: Water

Purple: Poison Water

Green: Toxic Ooze

White: Steam

Brown or Grey: Mud

Gray (With Entrance): Any fluid touching the Entrance

A Balloon may sometimes be attached to the end of the Nozzle and will not affect there being an Entrance or not.