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3. Challenger defect: 1986

Alternative clues for the word oring

• Certain NASA equipment ... shown literally in the solution to this puzzle
• Letter-shaped fitting
• Vital space-shuttle part
• Round sealing gasket
• Rubber sealing gasket
• Faucet repair item
• Part that failed on the Challenger
• Challenger's problem part
• Neoprene gasket
• Canning seal