The 4079 AprilAire Feed Tube and Nozzle is the water feed tube inside the humidifier, which connects the solenoid valve and then to the nozzle (#4184) at the top of the unit, which connects to the distribution tray (#4182 for Models 350 and 360.) Includes #4004 In-Line Strainer and #4232 Blue Orifice. Also includes compression sleeve and compression nut. Also see #4785 maintenance kit for models 350 and 360.