Tub Sub

$14.99
Availability: In stock (3)

Why do things sink or float? Tub Sub knows.

As a boat, it floats. As a sub, it sinks.

For a floating boat, push the flexible blue part down.

For a sinking sub, pull the blue part up and fill the bottom with water. Only the periscope (also a handle) will stay above the water.

Encourage thinking and reasoning

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