This kit contains everything you need to maintain your Aprilaire humidifier. The kit includes: #35 aqua Panel (QTY 1) 4266 - Feed Tube Assembly 4231 - Yellow Orifice (comes nested in feed tube) 4004 - Inline Strainer (included in feed tube envelope) Compression Nut and Ferule (included in feed tube envelope) 4277- liquid Distribution Tray 4236- Scale Control Insert. Tune Up Kit For Aprilaire Model 560 Series Humidifiers (Part # 4837). This Tune-Up Kit works for whole house large bypass humidifiers - models 560, 560A and 568
