Copper Lines & Fittings

Build reliable refrigerant runs with our copper lines, precision fittings, and pre-flared line sets for mini splits, heat pumps, and split AC. Get quality parts at budget-friendly prices with heavy inventory ready to go.

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Copper Lines & Fittings

This component category includes soft-drawn copper tubing, matched line sets, flare and braze fittings, insulation, and install accessories to connect indoor and outdoor HVAC units. DIY-capable homeowners, licensed contractors, property managers, and light commercial teams will find options for new installs, extensions, and repairs without overspending.

Shop by need: Copper Lines & Kits for traditional split systems, Ductless Mini Split Copper Lines & Kits for pre-flared convenience, and Copper Fittings, Insulation, Accessories for custom runs. Typical kits include suction and liquid lines with flare nuts, pre-installed insulation, and end caps; contents vary by model.

While these parts do not set SEER2, BTU, or tonnage ratings, correct sizing is critical for performance. Match suction and liquid line diameters, flare size, and total length to your equipment specifications. Many items are suitable for common refrigerants like R-410A and newer options such as R-32; always verify the individual product details. Observe the manufacturer’s maximum line length and allowable vertical rise to protect capacity and efficiency.

Installation ranges from simple routing and insulating to pro-level brazing, evacuation, and charging. DIYers can measure, route, and insulate; a licensed contractor should handle refrigerant work. Recommended tools include a flaring tool with gauge block, torque wrench, vacuum pump and micron gauge, nitrogen for pressure testing and purging, tube cutter, deburrer, and approved sealants and tape.

Top Brands for Copper Lines & Fittings

Choose proven solutions from Copper for quality soft tubing and line sets, K-Flex for durable closed-cell insulation, and Gree for pre-flared mini split kits. Popular sizes and lengths are kept in stock for fast turnaround.

Frequently Asked Questions

  • What size copper line set do I need for my mini split or heat pump?

    Use the manufacturer’s chart for your model and capacity. Match suction and liquid line diameters exactly.

  • Are these copper lines pre-insulated, and what insulation thickness is offered?

    Many line sets are factory insulated, commonly 3/8 to 1/2 inch wall. Check each item’s listed thickness.

  • Can these fittings and line sets be used with both R-410A and newer refrigerants?

    Most are suitable for R-410A and many for R-32. Always confirm compatibility on the product specification.

  • What is included in a copper line kit versus buying lines and fittings separately?

    Kits typically include pre-cut suction and liquid lines, flare nuts, factory insulation, and caps; contents vary.

  • How do I determine the correct line length and flare size for my system?

    Measure the run with allowances for bends, then follow the equipment manual for flare size and torque.

  • Do I need a licensed contractor to braze, evacuate, and charge the lines?

    Yes. Refrigerant handling generally requires a licensed professional to meet code and protect warranty.

  • Are K-Flex insulation products UV resistant for outdoor use?

    Many K-Flex products are UV resistant or UV-stable. Verify the specific model’s outdoor rating.

  • What tools and accessories are recommended for installing copper lines and fittings?

    Flaring tool, torque wrench, vacuum pump, micron gauge, nitrogen rig, tube cutter, deburrer, and tape.

  • How do copper line sets affect SEER2, BTU, or tonnage ratings?

    They do not set ratings, but correct size and length help maintain the equipment’s rated performance.

  • Can I extend or repair an existing line set, and what should I watch for?

    Yes, with proper brazing, nitrogen purging, evacuation, and leak testing. Keep sizes and cleanliness exact.

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