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Aprilaire Models 550, 550A & 558 Humidifier Parts

Please Click Here for the Aprilaire Models 550, 550A & 558 Diagram.

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Most parts will ship out the next business day. If backordered, may take an extra day or two.

Original Aprilaire Humidifier Pad, #10 Water Panel, $12.90 $12.90, 3/$32.85, 5/$53.55, 10/$104.80	#2 Scale Control Insert, #4217 $22.09	#3 Water Distribution Tray, #4218 $19.83
#4 Base, #4219 $67.98	#5 End Panel, #4220 Regular price: $49.50 Sale price: $44.45	#6 Duct Panel, #4221 Regular price: $44.00 Sale price: $43.54
#7 Cover with Latch and Label, #4222 Regular price: $64.00 Sale price: $56.06	Drain Spud, #4223 $5.52	Water Solenoid Valve, #4040 Regular price: $87.00 Sale price: $75.46
In Line Strainer, #4004 $5.78	Saddle Valve, #4001 $13.25	Orifice (Yellow), #4231 $3.00
#13 Feed Tube with Compression Sleeve, #4226 $10.16	Transformer, #4010 $22.66	Auto-Trac Humidistats, #56 $95.60
Manual Humidistat, #4016, Discontinued	Nozzle, #4184 Regular price: $12.00 Sale price: $10.78	#17 Cover Latch Spring, #4225 $9.03
Current Sensing Relay, #50 $44.04	Transformer, #4010 $22.66	Shock Arrestor, #4280 $101.86
Saddle Valve Adaptor, #4229 $36.09