MRCOOL DIY® 5th Gen 50 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set (for 6K Indoor Units)

The MRCOOL DIY® 5th Generation 50 ft. Pre-Charged Line Set is the ideal solution for installations of 6,000 BTU, 9,000 BTU, and 12,000 BTU indoor mini split units. Featuring 1/4" liquid and 3/8" suction lines, this long-run line set is pre-charged with R-454B refrigerant and sealed with MRCOOL’s patented Quick Connect fittings — allowing for a true DIY installation without special tools, gauges, or vacuum pumps.

Whether you’re working with a 5th Gen single-zone unit or a multi-zone DIY condenser with a 6K air handler, this 50 ft. line set provides the extra reach you need without sacrificing performance or efficiency.

🔧 Key Features

• Length: 50 feet – designed for long-distance HVAC installations

• Line Sizes: 1/4" liquid x 3/8" suction – sized for MRCOOL 6K, 9K, and 12K indoor units

• Pre-Charged with R-454B – Eco-friendly refrigerant sealed and ready for use

• Quick Connect Fittings – MRCOOL’s DIY-friendly connection system eliminates guesswork

• High-Quality Materials – Copper lines with white UV-resistant insulation for clean indoor and outdoor runs

• System Compatibility:

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

  • MRCOOL Multi-Zone Condensers: Multi2-18K, Multi3-27K, Multi4-36K, Multi5-48K
    (For multi-zone, line set must match air handler BTU rating.)

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✅ Installation Tips

• Ideal for long runs through attics, basements, or along larger exterior walls

• When extending beyond 25 feet, always ensure you're using the correct Pro Cable length and consider coupler kits if combining with other line sets

• Follow MRCOOL’s torque and connection guidelines for leak-free operation and warranty compliance

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Buy with confidence from MRCOOL DIY Direct — America’s #1 trusted source for MRCOOL HVAC systems, parts, and accessories. This 50 ft. pre-charged line set gives you the flexibility and performance you need for larger installs without the hassle of hiring a contractor.