Corrosion Resistant: Durable epoxy powder coat finish prevents external oxidation in high-humidity mechanical rooms

The thermostatic element and the replaceable cartridge must be selected separately based on your specific system capacity and refrigerant requirements

A functional switch will show a low resistance reading (closed)

providing superior suction line and liquid line protection without significant pressure drop

This valve requires a 24V power supply and is rated for 50/60Hz frequency

Aprilaire 4403 Insert 322057-301 Corrosion Resistant: Durable epoxy powderThe Aprilaire 4403 Scale Control Insert is a critical humidifier replacement part engineered specifically for the Aprilaire Model 400 series, including the 400A and 400M. This U shaped component serves as the structural frame for the water panel, ensuring it remains properly positioned for optimal evaporation. Designed with a built in float chamber, the 4403 manages water levels effectively to prevent internal leakage and overflow. Its primary