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3. Round gasket on a space shuttle

Alternative clues for the word oring

• Round sealing gasket
• Circular rubber gasket
• Faucet insert
• Gasket type
• NASA connector
• Part that failed on the Challenger
• Part of an airtight seal
• Faulty part of the Challenger
• Letter-shaped seal
• Certain NASA equipment … shown literally in the solution to this puzzle