Harmonica reed plates and plumbing: what they have in common

1. Step 1. Harmonica reed plates — is part of — Harmonica. Plates with slots for the reeds.
2. Step 2. Harmonica — works like — Accordion. Free-reed instruments; air comes from the lungs instead of bellows.
3. Step 3. Accordion — has part — Bellows. Bellows.
4. Step 4. Bellows — has part — Valve. A valve in the bellows lets air in when they open and keeps it from escaping back.
5. Step 5. Valve — is part of — Fire hydrant. A gate valve.
6. Step 6. Fire hydrant — uses — Plumbing. Plumbing.

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