🔍 Key Concepts

• How boiler tubes are installed vs how they are removed from headers • The difference between tools that tighten/expand metal and tools that loosen/pull out metal parts • Typical names/mechanics of tools used specifically for tube extraction in marine boilers

💭 Think About

• Think about which tool name suggests removal or backing out of something rather than enlarging or shaping it in place. • Ask yourself: which tool would be used when the tube is already in the header and you want it out, not tighter? • Consider which tools are associated with forming or sealing tube ends versus those associated with breaking the seal and withdrawing a tube.

✅ Before You Answer

• Identify which choice sounds like it would expand or tighten a tube rather than remove it. • Identify which option’s name suggests reversing or backing out an installed item. • Eliminate any tools that are clearly for forming, shaping, or finishing metal rather than extracting it.