Air Pump for Aquarium

A temporary energy free air pump for aquariums with just household items. This pumps air for 2-3 hours and can be reset easily.

1) Two Plastic Bottles with their Caps
2) A Plastic tube of 10 cm

Glue the caps together, the open sides facing opposite directions.
Drill a small hole on the caps

On one bottle, drill a hole on the top part and in the other, drill a hole near the bottom.

On the bottle with the hole in the top, insert the tube, glue it and seal it.

In the bottle with the hole in the bottom, fill water with your hand blocking the hole to prevent leakage
Cap it, invert it and cap it on the other bottle as shown.
Place the tube in the tank and you will see the pump pumping air bubbles.