Oxygen Sensor for Bird 6400 & Bird 8401 + MSA Mini Ox I, II, II, 3000 (18 mo warranty) - Replaces Competitive Sensors: Viasys Bird 66030, EnviteC OOM102-1, Maxtec (Ceramatec) MAX-13, Maxtec (Ceramatec) MAX-13-250, Puritan Bennet 4-020933, Respironics (Esprit) 1001454, Teledyne R17 (C-43690)