The PSR-11-33-MNB Oxygen Sensor with the 3-pin Molex connector, this sensor is often referred to generically as the R-22S and also plug compatible with the R-22D. Offering a faster response time than R-22D type sensors, the sensor is used in the Cochran Lifeguard, Divesoft, DiveTek Oz, DiveNav cootwo, Mares EANx, and OxySpy analyzers.