The Water, Poison Water, Steam, Toxic Ooze, and gray wheel. The brown colored wheel produces Mud in its driest form, and the gray wheel with the Mud symbol on it produces Mud in its wettest form.

Wheels are part of the pipe that will turn on and off the water. To turn on the wheel you press and hold the wheel. When you let go then the wheel stops and whatever was coming out will stop. 

Blue: Water

Purple: Poison Water

Green: Toxic Ooze

White: Steam

When a wheel is present then there will be no entrance.

In Change is Good there are some changing wheels.

Sometimes the wheels are attached to a pipe with an entrance. In this case the wheel will be gray. It works when a fluid touches the entrance, and it will not go through unless you touch the wheel.

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