Tune Up Kit For Aprilaire Model 350 and 360 Humidifiers (Part # 4785). This Tune-Up Kit works for stand-alone fan-powered humidifiers – models 350 and 360. This kit contains everything you need to maintain your Aprilaire humidifier. The kit includes: #35 Water Panel (QTY 1) 4079 – Feed Tube Assembly With Nozzle 4232 – Blue Orifice (comes nested in feed tube) 4004 – Inline Strainer (included in feed tube envelope) Compression Nut and Ferule (included in feed tube envelope) 4181 – Scale Control Insert 4182 – Water Distribution Tray 4183 – Water Distribution Tray Cover 4184 – Nozzle (included in feed tube envelope)