A fiber optic connector adapter, comprising: a base comprising surfaces that define an exterior of the base and an interior passage between front and rear openings (138, 140); a cap fastened to the base over one of the front and rear openings, wherein the cap has a port for a fiber optic connector defined therein, wherein the port includes a major dimension (M 1) extending along a first axis (A 1) and a minor dimension (M 2) extending along a second axis (A 2) that is orthogonal to the first axis (A 1), wherein the minor dimension (M 2) of the port is narrower than the major dimension (M 1), wherein the port includes only a single keyway, and wherein the keyway is: centered about the second axis (A 2) on a side of the port extending along the major dimension (M 1), offset from the first axis (A 1) in a first direction (D 1), and defined by an interior groove on the side of the port defining the major dimension (M 1), wherein the interior groove extends in a direction orthogonal to the first and second axis (A 1, A 2) toward the passage of the base; an interlock between the base and the cap, which positions and holds the cap with the port of the cap oriented to interface with the passage of the base such that a fiber optic connector inserted into the port of the cap and guided by the keyway is directed to connect with a second fiber optic connector, with the connection therebetween having a standard polarity, wherein the interlock between the base and the cap is releasable and reengageable, and wherein the cap is configured to be released from the base, rotated 180-degrees, and refastened to the base, via the interlock, having the keyway then offset from the first axis (A 1) in a second direction (D 2) that is opposite to the first direction (D 1), which positions and holds the cap with the port of the cap oriented to interface with the passage of the base such that the fiber optic connector inserted into the port of the cap and guided by the keyway is then directed to connect with the second fiber optic connector, with the connection therebetween having a reverse polarity. a base comprising surfaces that define an exterior of the base and an interior passage between front and rear openings (138, 140); a cap fastened to the base over one of the front and rear openings, wherein the cap has a port for a fiber optic connector defined therein, wherein the port includes a major dimension (M 1) extending along a first axis (A 1) and a minor dimension (M 2) extending along a second axis (A 2) that is orthogonal to the first axis (A 1), wherein the minor dimension (M 2) of the port is narrower than the major dimension (M 1), wherein the port includes only a single keyway, and wherein the keyway is: centered about the second axis (A 2) on a side of the port extending along the major dimension (M 1), offset from the first axis (A 1) in a first direction (D 1), and defined by an interior groove on the side of the port defining the major dimension (M 1), wherein the interior groove extends in a direction orthogonal to the first and second axis (A 1, A 2) toward the passage of the base; centered about the second axis (A 2) on a side of the port extending along the major dimension (M 1), offset from the first axis (A 1) in a first direction (D 1), and defined by an interior groove on the side of the port defining the major dimension (M 1), wherein the interior groove extends in a direction orthogonal to the first and second axis (A 1, A 2) toward the passage of the base; an interlock between the base and the cap, which positions and holds the cap with the port of the cap oriented to interface with the passage of the base such that a fiber optic connector inserted into the port of the cap and guided by the keyway is directed to connect with a second fiber optic connector, with the connection therebetween having a standard polarity, wherein the interlock between the base and the cap is releasable and reengageable, and wherein the cap is configured to be released from the base, rotated 180-degrees, and refastened to the base, via the interlock, having the keyway then offset from the first axis (A 1) in a second direction (D 2) that is opposite to the first direction (D 1), which positions and holds the cap with the port of the cap oriented to interface with the passage of the base such that the fiber optic connector inserted into the port of the cap and guided by the keyway is then directed to connect with the second fiber optic connector, with the connection therebetween having a reverse polarity.