AST-14D2 diving oxygen sensor FOR JJ-CCR Rebreather. It also replaces JJ-CCR oxygen sensor and PSR-11-39-JJ O2 sensor. Sensor has the female SMB connector on cable. 40 months life in air. AST utilizes proprietary electrolyte formulation and anode structure ensuring 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.