Aprilaire 4403 Insert 319825-402 Its M12 female connector ensures

Its M12 female connector ensures a secure

Leak-Proof Seal: Utilizes a specialized Teflon gasket within the rotolock housing to ensure a gas-tight seal under high-pressure conditions

For a complete TJLE assembly

Integrating this HVAC valve repair kit into your maintenance schedule prevents the costly full replacement of the valve body while resolving common bypass or leakage issues

Debris Protection: Includes an internal inlet filtered screen to prevent sediment from compromising the valve seat

Aprilaire 4403 Insert 319825-402 Its M12 female connector ensuresThe 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