The AprilAire 4235 Feed Tube and Nozzle is the water feed tube inside the humidifier, which connects the solenoid valve and then to the top of the unit. The nozzle attaches to the inside, top of the base of the humidifier. Includes #4004 In-Line Strainer and #4231 Yellow Orifice. Also includes compression sleeve and compression nut. Also see the maintenance kit part number 4750.