A valve for an exterior aircraft light unit, the valve comprising: an inlet fitting body having a non-magnetic collar portion and a magnetic shoulder portion , wherein the non-magnetic collar portion at least partially defines a lighting cavity , wherein the magnetic shoulder portion comprises an inner surface; an outer body ; an inner body disposed within the outer body , the inner body comprising: a poppet disposed between the inner surface of the shoulder portion and a seat , wherein the inner surface of the magnetic shoulder portion faces the inner body and the poppet; wherein the seat is configured to support the poppet; an air gap extending between the magnetic shoulder portion inner surface and the poppet; a polymer seal retained within an annular groove of the poppet, wherein the polymer seal is configured to couple the poppet to the inner surface of the shoulder portion of the inlet fitting body; and a permanent magnet disposed between the inner body and an outer body of the valve, wherein the magnet further comprises an inner cylindrical face having a north pole and an outer cylindrical face having a south pole, the outer cylindrical face being radially opposite the inner cylindrical face , wherein the magnet of the valve is configured to induce a magnetic flux circuit , wherein the magnetic flux circuit induced by the magnet comprises a plurality of closed loop paths containing a magnetic flux, wherein the magnetic flux originates from the inner cylindrical face of the magnet, flows through the inner body and up the poppet, traverses the air gap into the magnetic shoulder portion of the inlet fitting body, flows down the inner body and into the outer body, and terminates at the outer cylindrical face of the magnet. an inlet fitting body having a non-magnetic collar portion and a magnetic shoulder portion , wherein the non-magnetic collar portion at least partially defines a lighting cavity , wherein the magnetic shoulder portion comprises an inner surface; an outer body ; an inner body disposed within the outer body , the inner body comprising: a poppet disposed between the inner surface of the shoulder portion and a seat , wherein the inner surface of the magnetic shoulder portion faces the inner body and the poppet; wherein the seat is configured to support the poppet; an air gap extending between the magnetic shoulder portion inner surface and a poppet disposed between the inner surface of the shoulder portion and a seat , wherein the inner surface of the magnetic shoulder portion faces the inner body and the poppet; wherein the seat is configured to support the poppet; an air gap extending between the magnetic shoulder portion inner surface and the poppet; a polymer seal retained within an annular groove of the poppet, wherein the polymer seal is configured to couple the poppet to the inner surface of the shoulder portion of the inlet fitting body; and a permanent magnet disposed between the inner body and an outer body of the valve, wherein the magnet further comprises an inner cylindrical face having a north pole and an outer cylindrical face having a south pole, the outer cylindrical face being radially opposite the inner cylindrical face , a polymer seal retained within an annular groove of the poppet, wherein the polymer seal is configured to couple the poppet to the inner surface of the shoulder portion of the inlet fitting body; and a permanent magnet disposed between the inner body and an outer body of the valve, wherein the magnet further comprises an inner cylindrical face having a north pole and an outer cylindrical face having a south pole, the outer cylindrical face being radially opposite the inner cylindrical face , <EOS>