A fiber optic adapter including a housing, a deflectable member and a locking member. The housing has a longitudinal passage extending between a first opening at a first end of the housing and a second opening at a second end of the housing, and the housing is sized to fit within a fiber optic receptacle. The deflectable member is in the longitudinal passage of the housing and configured to retain a fiber optic terminus in the housing. The locking member is interfaced with the housing and is sized to fit within a retaining notch in the fiber optic receptacle to prevent separation of the housing from the receptacle. The adapter may be an in-line embedded adapter that does not introduce optical loss to optically and mechanically couple an LC receptacle and a terminus.