Tank

Aquarium airstone

Illustration of airstone for aquarium tank

Aquarium tank

Illustration of aquarium tank

Aquarium tank from top

Illustration of aquarium tank from top

Aquarium tank from top 2

Illustration of aquarium tank from top

Aquarium tank with mesh and airstone

Illustration of aquarium tank with mesh and airstone setup

Military: armored tank

Illustration of armored tank

Water: septic system 1

Illustration of a septic system with a rectangular tank and incoming and outgoing pipes

Water: septic system 2

Illustration of a cylindrical tank with pipes leaving it

Water: water tower

3-D Illustration of a water tower