Aprilaire & General Replacement Solenoid Valves 4040, 990-53 Water Valves, Strainers, & Orifices to fit the following General and Aprilaire Furnace, Whole House Humidifiers: Aprilaire: 110, 112, 220, 224, 350, 360, 400, 440, 445, 445A, 445-A, 448, 550, 550A, 550-A, 558, 560, 560A, 560-A, 568, 600, 700, 760, 760A, 760-A, 768 General: 709, 1040, 1042 We also carry Aprilaire Humidifier Filters and General Humidifier Filters Aprilaire Humidifier Part - 4040 Water Valve Solenoid, 24 Volt - $34.99 Each When You Buy 12 $49.99, 3/$119.97, 12/$419.88 Aprilaire Humidifer & Generalaire Humidifier 24 Volt Sensing Relay #50 - $19.00 $19.00 General 990-53 Humidifier Water Valve Assembly, 24 Volt - $39.99 Each When You Buy 12 $47.99, 3/$134.97, 12/$479.88 General Humidifier Solenoid Valve 120 Volt GeneralAire 1040 and 1042 990-52 - $59.99 $59.99 Aprilaire #4004 Humifier water line strainer - $3.99 $3.99 Aprilaire Humidifier 110 & 120 Part - White Orifice 4007 - $2.49 $2.49 Aprilaire Humidifier 112 & 224 Part - Red Orifice 4021 -$2.49 $2.49 Search Here: E-mail Us Privacy Policy Shipping Rates View Cart