EBayFitment: 4655 Manual Humidifier Control fits the Ap-rilaire humidifier 110, 112, 220, 224, 350, 360, 400, 440, 445, 445A, 448, 500, 550, 558, 560, 560A, 568, 600, 700, 760, 760A and 768. Replacement for Ap-rilAire 4655 4016 Ca-rrier 4363 Whole Home Pipe or Wall Mounted Humidifier Switch Control 24VAC (White). Installation location: It can be installed on the walls of your living space, about 5 feet away from the floor, or installed on pipes near HVAC equipment. Installation method: Easy to install, remove the old device, pop out the old humidity regulator and ensure it is a 2-wire system, just wire it. Attention: Please confirm the product model before placing an order. 4655 Manual Humidifier Control fits the Ap-rilaire humidifier 110, 112, 220, 224, 350, 360, 400, 440, 445, 445A, 448, 500, 550, 558, 560, 560A, 568, 600, 700, 760, 760A and 768. Replacement for Ap-rilAire 4655 4016 Ca-rrier 4363 Whole Home Pipe or Wall Mounted Humidifier Switch Control 24VAC (White) Function: Manual digital control humidity regulator is designed for low-voltage service. Just turn the dial to control your humidification equipment and adjust the appropriate humidity for your home Installation location: It can be installed on the walls of your living space, about 5 feet away from the floor, or installed on pipes near HVAC equipment Installation method: Easy to install, remove the old device, pop out the old humidity regulator and ensure it is a 2-wire system, just wire it Attention: Please confirm the product model before placing an order