Boot shaft and aerosol can: what they have in common

1. Step 1. Boot shaft — is part of — Wellington boots. The tall part.
2. Step 2. Wellington boots — is made of — Natural rubber. The first rubber boots were natural rubber.
3. Step 3. Natural rubber — is material for — Spray bottle. A rubber bulb.
4. Step 4. Spray bottle — has part — Check valve. A valve.
5. Step 5. Check valve — is a kind of — Valve. A kind of valve.
6. Step 6. Valve — is part of — Aerosol can. A valve.

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