Universal joint and bellows: what they have in common

1. Step 1. Universal joint — is part of — Car. A universal joint carries rotation to the rear axle.
2. Step 2. Car — has part — Carburettor. In older cars the carburettor mixed petrol with air for the engine.
3. Step 3. Carburettor — has part — Valve. A throttle valve in the carburettor sets how much fuel-air mix reaches the engine.
4. Step 4. Valve — is part of — Bellows. A valve in the bellows lets air in when they open and keeps it from escaping back.

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