SRX-CTR30 Oxygen Sensor, a drop-in replacement to IT Gambert D-18 % oxygen sensor, is a galvanic type micro fuel cell specific to oxygen. 7-13mV in ambient air, 36 months expected life in ambient air. Three PIN Molex connector, flat front. Proprietary electrolyte formulation ensures full utilization of Pb anode, thus providing longer life without signal drift and minimizing periodic calibration requirement. Sensor is designed, developed and manufactured in the USA.