This type of LiOH canister was made famous by the Apollo 13 mission, where the astronauts were forced to move
into the Lunar Module (LM) for most of the flight. Having exhausted the capacity of the LM LiOH canisters, the Command Module (CM) canisters were needed. However, the square CM canisters
did not fit into the round LM openings. So a workaround was devised using the CM canisters with hoses, tape, and other items.