Blowpipe gathering end and boiler: what they have in common

1. Step 1. Blowpipe gathering end — is part of — Glassblowing. A thickened end on which the melt is gathered.
2. Step 2. Glassblowing — is used in — Glass bottle. Blowing.
3. Step 3. Glass bottle — includes — Soda siphon. A soda siphon is a strong bottle charged with carbon dioxide.
4. Step 4. Soda siphon — has part — Valve. A valve.
5. Step 5. Valve — is part of — Central heating. Valves on the radiators set how much hot water flows into a room.
6. Step 6. Central heating — has part — Boiler. A boiler.

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