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

Constructed with a coated closed-cell foam sleeve that functions as a pre-filter and flow dispenser

this refrigerant metering device is built to withstand high-pressure environments up to 660 psig

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

Aprilaire 4403 Insert 322057-301 A functional switch will showThe 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