Atmosphere recycler
An atmosphere recycler, also referred to as an atmospheric recycler, or O2 recycler, was a component of a life support system that was responsible for recycling old atmosphere into breathable oxygen.

O2 recyclers were standard equipment aboard mid-22nd century Earth . () Simultaneously they were used aboard stasis pods maintained by the Retellians. ()

 starships were equipped with several atmosphere processors. When  was thrown back in time, the crew made several improvements to the vessel over the next century, including the doubling of the efficiency of the ship's atmosphere processors. ()

Upon inspection of the automated Romulan drone ship, boarded by Charles Tucker III and Malcolm Reed, Tucker was unable to find anything that resembled an atmosphere recycler on board the ship. ()

Atmospheric recyclers were one of the components used in 24th century Starfleet EV suits. ()

See also 
 Atmospheric recycle and processing subsystem
 Atmospheric recycling manifold
 Recyclic life support system

External link
 
Life support technology