Tube connector and diesel engine: what they have in common

1. Step 1. Tube connector — is part of — Catheter. Connection to the bag.
2. Step 2. Catheter — is part of — IV drip. A catheter.
3. Step 3. IV drip — has part — Syringe. A needle.
4. Step 4. Syringe — has part — Piston. A plunger.
5. Step 5. Piston — is part of — Diesel engine. Pistons move in the cylinders.

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