Aprilaire Feed Tube For Use With: 700M 760A and 768 Models Humidifiers Plastic Includes: Orifice Ferule (2) Compression Nut and Strainer � This is the water feed tube which attaches to the outlet side of the solenoid valve and the feed tube slides into a nozzle � The nozzle attaches to the inside top of the base of the unit which mounts to the heating/air conditioning ductwork