Plumbing and multistage rocket: what they have in common

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

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