The old building had several speaking tubes installed for communication.

The neural tubes develop into the brain and spinal cord.

I need to buy some microfuge tubes for the experiment.

I have a collection of audion tubes.

Discharge tubes are used in various electronic devices.

I need to buy some filter tubes for my aquarium.

I need to replace the fluorescent tubes in the office.

I need to order some Gerber tubes for the project.

The players in the game were using noob tubes to gain an advantage.

The old television sets used picture tubes.