Mueller Duraguard Mini-Split Line Set – 3/8" x 5/8" x 25 Ft – Streamline® 40620250B6C
The Mueller Duraguard line set (model 40620250B6C) is a factory-insulated copper tubing assembly used for ductless mini-split air conditioning systems. It includes 25 feet of Type ACR copper tubing—3/8" outside diameter (liquid line) and 5/8" outside diameter (suction line)—produced from UNS C12200 alloy. The tubing is nitrogen-charged and meets ASTM B280 specifications to ensure cleanliness for refrigeration applications.
Specifications
Line Set Length: 25 ft
Liquid Line OD: 3/8 in
Suction Line OD: 5/8 in
Tubing Material: Seamless copper (UNS C12200), nitrogen-charged
Standard Compliance: ASTM B280
Insulation: Pre-applied Duraguard UV™ polyethylene foam, 1/2" wall thickness
Operating Pressure: Up to 700 psi
Temperature Range: Up to 250°F
Refrigerant Compatibility: Suitable for R-410A, R-32, and other high-pressure refrigerants
Application: Designed for use in mini-split and ductless HVAC installations
Product Features
ASTM B280 Copper: Seamless, clean, and oxidation-free interior for direct refrigeration circuit integration
Duraguard UV™ Insulation: UV- and weather-resistant polyethylene foam insulation limits heat gain and moisture intrusion
Pressure Rated: Supports pressures up to 700 psi for use with modern refrigerants and systems operating under high load
Pre-Charged and Capped: Tubing is sealed under nitrogen charge to prevent oxidation during storage and handling
Flexible Configuration: Coiled design allows for routing in compact installations without the need for excessive joints or fittings
Installation Considerations
This product is intended for professional HVAC installation and may require flaring, brazing, or other field-end preparation depending on equipment specifications. Insulation joints must be sealed to maintain vapor barrier integrity. Verify system refrigerant compatibility and observe all local code requirements.
Contractor Notes
Mueller's Duraguard line set delivers performance in both residential and light commercial ductless installations. The corrosion-resistant copper construction, high-pressure rating, and field-ready insulation reduce labor time and ensure system reliability. Preferred by contractors for retrofits and new system builds where consistent quality is critical.