Apollo Command Module LiOH Filter Assembly, dated March 20, 1969 (two months before Apollo X).
7.25 x 7.25 x 5.25, bearing an affixed label with embossed part specifications, headed “Absorber Element” and noting “Ref. Spec. ME901-0218-0051.”
This piece of equipment would be utilized in conjunction with the Apollo Command Module Environmental Control Unit (ECU) to remove carbon dioxide and to filter particulate from the atmosphere.
backside 
As jerry-rigged in the Apollo 13 LM (square box for a round hole). Note the torn strips of duct table running at right angles and plugging the center: 
Filter box goes 
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