The Aprilaire 4226 Feed Tube with compression sleeve is used in the Model 550. This tubing connects to the solenoid and feeds water to the water distribution tray. The plastic tubing is 1/4" OD and 27" length. Includes strainer, yellow orifice, brass compression fitting and plastic ferrule. Yellow orifice sized to deliver 3 gph.
Not compatible with model 560, 560A and 568
. The 560 series require the 29-1/4" long feed tube known as Aprilaire 4266
. Not compatible with model 500,
unless the feed tube is cut down. The 500 humidifier require 21" long feed tube known as Aprilaire 4335