Lennox X7785 – DiversiTech DAD303S liquid line filter drier is a high-capacity HVAC protection component designed to keep refrigeration and air conditioning systems clean, dry, and operating efficiently. This filter drier is engineered to remove moisture, acids, and solid contaminants from the liquid refrigerant line, helping prevent corrosion, refrigerant breakdown, and premature compressor failure.
Built for use in 3 to 5 ton residential and light commercial HVAC systems, the DAD303S features a 30 cubic inch desiccant core and durable steel construction for long service life. The 3/8 inch ODF solder connections allow for secure brazed installation, making it ideal for both new system installs and replacement applications. As a Lennox-approved part manufactured by DiversiTech, this filter drier meets OEM performance and reliability standards.
Key features and benefits:
• 30 cubic inch moisture and acid absorption capacity
• Designed for 3–5 ton air conditioning and heat pump systems
• 3/8 inch ODF solder connections for leak-free installation
• Helps protect compressors and expansion devices
• Supports proper refrigerant flow and system efficiency
• Suitable for new installations and service replacements
Typical applications:
This liquid line filter drier is commonly used in split systems, packaged units, and heat pump applications where refrigerant cleanliness is critical. It is compatible with common HVAC refrigerants when installed according to manufacturer guidelines.
Product specifications:
Brand: DiversiTech
Catalog Number: X7785
Manufacturer Part Number: DAD303S
Type: Liquid Line Filter Drier
Capacity: 30 cu in
Connection Size: 3/8 inch ODF solder
System Size Compatibility: 3–5 tons
Application: Residential and light commercial HVAC systems
The Lennox X7785 DiversiTech DAD303S liquid line filter drier is a dependable OEM-grade solution for maintaining refrigerant purity, extending equipment life, and ensuring consistent HVAC system performance. Ideal for contractors and technicians who require reliable filtration and moisture control in demanding HVAC applications.

