MRCOOL DIY® 5th Gen 35 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set (for 6K - 9K - 12K Indoor Units)

Extend your installation reach with the MRCOOL DIY® 5th Gen 35 ft. Pre-Charged Line Set, designed for use with 6,000 - 9,000 - 12,000 BTU MRCOOL mini split indoor units. Featuring 1/4" liquid and 3/8" suction lines, this set arrives pre-charged with eco-friendly R-454B refrigerant and includes Quick Connect fittings for a fast, safe, and truly DIY-friendly installation — no need for special tools, gauges, or HVAC certification.

This 35 ft. line set is ideal when the standard 25 ft. length isn’t enough, giving you flexibility for longer runs while maintaining performance and efficiency. It’s fully compatible with all MRCOOL DIY 5th Gen single-zone 9K, 12K systems, as well as multi-zone condensers that include a 6K air handler.

🔧 Key Features

• Line Set Length: 35 feet – ideal for longer installations with 6K units

• Line Sizes: 1/4" liquid x 3/8" suction – sized for optimal performance with 6,000 - 9,000 - 12,000 BTU air handlers

• Pre-Charged with R-454B Refrigerant – Factory-sealed, eco-friendly, and ready to install

• Quick Connect Technology – Patented MRCOOL fittings allow tool-free DIY installation

• Protective Outer Sleeve – Durable, white UV-resistant insulation for indoor and outdoor use

• System Compatibility:

  • MRCOOL DIY® 5th Gen 9K - 12K single-zone systems

  • MRCOOL Multi-Zone DIY Systems: Multi3-18K, Multi4-27K, Multi5-36K, Multi6-48K, Multi6-55K
    (Line set must match air handler BTU rating in multi-zone setups)

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✅ Installation Notes

• Great for longer wall runs or installations where the condenser is farther from the air handler

• For setups exceeding 35 feet, use MRCOOL coupler kits and longer Pro Cable (sold separately)

• Always follow MRCOOL’s torque specifications and installation best practices to maintain your warranty

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Shop with confidence at MRCOOL DIY Direct — the leading authority in DIY HVAC solutions. We offer genuine MRCOOL parts, unmatched support, and fast nationwide shipping. This 35 ft. pre-charged line set gives you the flexibility and performance needed for hassle-free mini split installations.