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AST-14D Oxygen Sensor for scuba diving, is a replacement to AP Diving Model APD14 O2 sensor. It fits in Inspiration, Evolution, XCCR and Flex rebreathers. It also replaces PSR-11-39-SMB O2 sensor. AST utilizes proprietary electrolyte formulation and anode structure that ensures full utilization of Pb anode, thus providing longer life without signal drift and minimizing periodic calibration requirement. AST brand sensors are designed, developed and manufactured in the USA.