Humidification Parts and Accessories Help maintain your customers' indoor humidity at its best. Remember, too little humidity can damage a home and its contents. To operate at peak efficiency, flow through humidifiers need new pads every season. Honeywell Hardware Kit for Solenoid Assembly serves as Humidifier Replacement Part and is used with Honeywell's HE220, HE225, HE260, HE265, HE360, HE365 humidifier series. Notice: Honeywell Solenoid Valve Assembly does not include solenoid valve.