Multiple rocket launcher and plumbing: what they have in common

1. Step 1. Multiple rocket launcher — uses — Solid rocket motor. Rockets.
2. Step 2. Solid rocket motor — has part — De Laval nozzle. A nozzle.
3. Step 3. De Laval nozzle — is part of — Liquid-propellant rocket engine. A nozzle.
4. Step 4. Liquid-propellant rocket engine — has part — Centrifugal pump. Turbopumps deliver the propellant.
5. Step 5. Centrifugal pump — is part of — Water tower. Filled by pumps.
6. Step 6. Water tower — is part of — Plumbing. Maintaining pressure.

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