Graded artificial dielectrics using nanostructures, such as nanowires, are disclosed. The switch dome is resiliently pressable to urge the central portion toward the printed circuit board and pivot the contacting portions about a corresponding fulcrum to remove the plurality of contacting portions of the switch dome from contact with at least one of the first and second contact areas to open the switch. An outlet tube is extended upstream from a decoupler outlet to an outlet-tube step that includes a radially inward extension of the outlet tube to proximate an outside surface of the damper seat.