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Ultra fine filters are disposable; for optimal performance they should be changed regularly when they appear soiled or discolored.
DIMENSIONS: Approximately 1.75 inches long by .75 inches wide.
COMPATIBILITY: GoodKnight 420G CPAP, GoodKnight 420E Auto-CPAP, GoodKnight 420S CPAP, GoodKnight 420SP CPAP, GoodKnight 425 BiLEvel, GoodKnight 425 ST BiLevel