Model 550 Series Parts
Replaceable components for Aprilaire Model 550 humidifiers. Distribution trays, scale control insert more. All parts are shipped in "single" carton quantities.
4004 In Line Strainer
The In-Line Strainer is a tiny strainer that fits in the inlet fitting of the water solenoid valve which allows water to enter your humidifier....
4040 24 Volt Solenoid Valve
The solenoid valve allows water to come into your humidifier. This valve can be used on all Aprilaire humidifiers ...
9960 Weather Station
Digital Weather Station. Operates on one AAA battery. Displays current temperature and relative humidity. Displays in Celsius or Fah...
4223 Drain Spud - For Models All 500 & 600 Series
This is the plastic fitting which attaches to the base of the housing of your humidifier. It is designed to allow for the connection of the 1/2" d...
4793 Maintenance Kit for Aprilaire Model 550
This kit includes everything you need to make your Aprilaire Model 550 Series like new: #10 water panel, #4217 Scale Control Insert (black plastic fra...
FREE Shipping on Maintenance Kit
4231 Yellow Orifice
These are the tiny nylon components which, accurately meter the flow of water into your humidifier. They allow a specific amount of water to go into t...
4001 Saddle Valve
This is the self-tapping water valve that attaches to the water line in your home and supplies water to the Aprilaire Humidifier via copper tubing...
4217 Scale Control Insert - For Model 550, 550A & 568
This is the u-shaped component which encases the Water Panel Evaporator. Their purpose is to direct any mineral which builds up back into the evap...
4218 Water Distribution Tray - For Model 550, 550A & 558
These are the water distribution trays which distribute water evenly to all portions of the water panel. They attach to the u-shaped scale control...
4226 Water Feed Tube - For Models 550, 550A & 558
Water Feed Tube w/Compression Sleeve. Connects to the solenoid valve and delivers water to the distribution tray, part number 4218. Also s...
4184 Nozzle - For Model 350, 360, 550 and 560 Series
This is the component where the feed tube slides into at the top of the water panel evaporator assembly. The nozzle attaches to the water distribu...
Part # 10 Water Panel Evaporator
Fits Models 550, 550A, 500, 110 and 220. Water Panel Evaporators are the heart of your humidifier and the component which generates the important hum...
Buy any 2 of the same water panel and receive free shipping. (Shipping to U.S. only)