Multistage rocket and plumbing: what they have in common

1. Step 1. Multistage rocket — has part — Liquid-propellant rocket engine. Engines on every stage.
2. Step 2. Liquid-propellant rocket engine — has part — Centrifugal pump. Turbopumps deliver the propellant.
3. Step 3. Centrifugal pump — is part of — Water tower. Filled by pumps.
4. Step 4. Water tower — is part of — Plumbing. Maintaining pressure.

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