How did the Apollo 13 engineers fit a round peg in a square hole rapidly? In the movie, they had to fit a round filter in a square filter box or the
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Were the Apollo CO₂ scrubber canister designs unified after Apollo 13? - Space Exploration Stack Exchange
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APOLLO CO2 ABSORBER FILTER ASSEMBLY, AIRESEARCH PART 813540-2-1 | Space Exploration | Books & Manuscripts | Sotheby's
![BBC World Service - 13 Minutes to the Moon, Apollo 13: Enhanced photos reveal life on board - Jack Swigert (right) looks at Jim Lovell as they work together. The CO2 filter BBC World Service - 13 Minutes to the Moon, Apollo 13: Enhanced photos reveal life on board - Jack Swigert (right) looks at Jim Lovell as they work together. The CO2 filter](https://ichef.bbci.co.uk/images/ic/320x180_b/p08b13bh.jpg)