Cardboard tube core and rock drill: what they have in common

1. Step 1. Cardboard tube core — is part of — Toilet paper. The cardboard core of the roll.
2. Step 2. Toilet paper — is used in — Flush toilet. Hygiene.
3. Step 3. Flush toilet — has part — Valve. The cistern’s float valve.
4. Step 4. Valve — is part of — Boyle’s air pump. Valves.
5. Step 5. Boyle’s air pump — has part — Piston. A plunger.
6. Step 6. Piston — is part of — Rock drill. A percussion piston.

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