Tune Up Kit For Aprilaire Model 400 Series Humidifiers (Part # 4788). This Tune-Up Kit works for whole house large bypass humidifiers - models 400, 400A, 400M. WATCH MAINTENANCE VIDEO This kit contains everything you need to maintain your Aprilaire humidifier. The kit includes: #45 Water Panel (QTY 2) 4335 - Feed Tube Assembly 4231 - Orifice (comes nested in feed tube) 4004 - Inline Strainer (included in feed tube envelope) Compression Nut and Ferule (included in feed tube envelope) 4403 - Scale Control Insert 4407 - Water Distribution Tray 4406 Float Assembly (QTY 2- included inside scale control insert assembly) 4405 Float Cover (included inside scale control insert assembly)
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