MRCOOL DIY® 5th Gen 25 ft. 1/4" x 1/2" Pre-Charged Quick Connect Line Set (for 9K, 12K & 18K Indoor Units)

MRCOOL DIY® 5th Gen 25 ft. 1/4" x 1/2" Pre-Charged Quick Connect Line Set (for 9K, 12K & 18K Indoor Units)

The MRCOOL DIY® 5th Generation 25 ft. Pre-Charged Line Set is purpose-built for use with 9,000 BTU, 12,000 BTU, and 18,000 BTU indoor air handlers. With 1/4" liquid and 1/2" suction lines, this line set is factory pre-charged with R-454B refrigerant and features MRCOOL’s patented Quick Connect fittings, making installation simple, fast, and completely DIY-friendly — no vacuum pumps, gauges, or professional tools required.

This 25 ft. line set is the standard length included with most MRCOOL DIY mini split systems and is perfect for connecting your air handler to the condenser in typical residential setups. Compatible with both single-zone and multi-zone 5th Gen MRCOOL systems.

🔧 Key Features

• Length: 25 feet – perfect for standard HVAC installations

• Line Sizes: 1/4" liquid x 1/2" suction – compatible with 9K, 12K, and 18K indoor air handler units

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

• Quick Connect Fittings – Patented tool-free connection system ideal for DIY installation

• Durable Construction – UV-resistant white sleeve with insulated copper tubing

• System Compatibility:

  • MRCOOL DIY® 5th Gen 9K, 12K, & 18K single-zone systems

  • MRCOOL Multi-Zone DIY Systems: Multi2-18K, Multi3-27K, Multi4-36K, Multi5-48K
    (Line set must match indoor air handler BTU rating in multi-zone systems.)

✅ Installation Tips

• Standard 25 ft. length works for most installs; if you need longer runs, use line set couplers and the appropriate length Pro Cable

• Be sure to follow MRCOOL’s installation instructions, torque specs, and best practices for leak-free operation

• Maintain system performance and warranty coverage by using only approved components

Order from MRCOOL DIY Direct – the most trusted nationwide retailer for genuine MRCOOL systems, parts, and accessories. Whether you're replacing a damaged line set or installing a new DIY mini split system, this 25 ft. pre-charged line set ensures a clean, efficient, and hassle-free setup.