Mueller 61220250C Copper Line Set – 3/8" x 3/4" x 1/2" x 25' DuraGuard Coated, Nitrogen-Charged

The Mueller 61220250C Copper Line Set is a refrigeration-grade, nitrogen-charged copper tubing assembly designed for HVAC and refrigeration applications requiring clean, high-pressure, and corrosion-resistant connections. Manufactured from seamless UNS C12200 copper, the tubing meets ASTM B280 standards for Air Conditioning and Refrigeration (ACR) service. The DuraGuard™ protective coating provides enhanced abrasion and environmental resistance for indoor and outdoor installations. This line set is engineered for use with high-pressure refrigerants, including R-410A and R-32, ensuring system reliability and compliance with modern refrigerant standards.

Details

• Manufacturer: Mueller Industries
• Model Number: 61220250C
• Product Type: Refrigeration-Grade Copper Line Set
• Configuration: 3/8" Liquid Line x 3/4" Suction Line x 1/2" Insulation x 25' Length
• Material: Seamless Copper – UNS C12200 (Phosphorus-Deoxidized, Non-Arsenical)
• Manufacturing Standard: ASTM B280 – ACR Specification
• Internal Treatment: Nitrogen-charged for oxidation prevention and system cleanliness
• Exterior Protection: DuraGuard™ polymer coating for abrasion and corrosion resistance
• Outer Diameter (Suction Line): 3/4 inch (19.05 mm)
• Outer Diameter (Liquid Line): 3/8 inch (9.53 mm)
• Insulation Thickness: 1/2 inch (12.7 mm)
• Length: 25 feet (7.62 meters)
• Maximum Working Pressure: 700 psi
• Maximum Service Temperature: 250°F (121°C)
• Wall Type: Seamless, drawn copper tubing
• Ends: Capped and sealed under nitrogen charge
• Refrigerant Compatibility: R-410A, R-32, and other high-pressure refrigerants
• Installation Type: Field-brazed or flared connections
• Corrosion Resistance: High – interior and exterior protection from oxidation and environmental exposure
• Compliance: ASTM B280, UL Recognized, RoHS Compliant

Technical Application

The Mueller 61220250C ACR copper line set is engineered for refrigerant transport in air conditioning, heat pump, and refrigeration systems. The seamless, nitrogen-purged copper construction eliminates internal oxidation, preserving refrigerant purity and minimizing system contamination. The DuraGuard-coated exterior provides mechanical protection against environmental wear during routing and service. This product supports high-pressure refrigerants and is suited for both residential and commercial system installations. Each coil is pressure-sealed, capped, and ready for field fabrication, ensuring compliance with mechanical code requirements and manufacturer specifications.

Specifications

• Liquid Line OD: 3/8 inch (9.53 mm)
• Suction Line OD: 3/4 inch (19.05 mm)
• Insulation Thickness: 1/2 inch (12.7 mm)
• Length: 25 feet (7.62 meters)
• Material Grade: UNS C12200 Copper (Phosphorus-Deoxidized)
• Manufacturing Process: Seamless, drawn tubing – nitrogen-charged interior
• Working Pressure: 700 psi (maximum)
• Service Temperature: Up to 250°F (121°C)
• Exterior Protection: DuraGuard™ polymer jacket
• Internal Condition: Nitrogen-sealed, oxidation-free
• Refrigerant Compatibility: R-410A, R-32, R-22, and other approved ACR refrigerants
• Compliance: ASTM B280, UL Listed, RoHS Compliant
• End Sealing: Factory-capped and nitrogen-charged
• Intended Use: HVAC and refrigeration system refrigerant transport

Installation and Use

Installation should be performed by qualified HVAC professionals in accordance with local and national mechanical codes. Tubing must be cut square, deburred, and cleaned before brazing or flaring. Maintain sealed ends until assembly to prevent contamination. When brazing, purge with nitrogen to avoid internal oxidation. The DuraGuard coating allows for direct contact with building materials and environmental exposure without risk of surface corrosion or abrasion damage.

Summary

The Mueller 61220250C Copper Line Set (3/8" x 3/4" x 1/2" x 25') is a seamless, nitrogen-charged ACR copper assembly manufactured from C12200 copper and protected with DuraGuard coating for enhanced durability. Designed to ASTM B280 standards, it supports high-pressure refrigerants such as R-410A and R-32 and maintains system cleanliness and pressure integrity. The combination of internal nitrogen protection and exterior coating ensures long-term reliability and efficiency in HVAC and refrigeration system installations.