MRCOOL DIY® 5th Gen 16 ft. 1/4" x 1/2" Pre-Charged Quick Connect Line Set (for 18K Indoor Units)

The MRCOOL DIY® 5th Generation 16 ft. Pre-Charged Line Set is specifically designed for 18,000 BTU indoor air handlers. Featuring 1/4" liquid and 1/2" suction lines, this line set comes factory pre-charged with eco-friendly R-454B refrigerant and equipped with MRCOOL’s exclusive Quick Connect fittings — eliminating the need for vacuum pumps, gauges, or HVAC licensing.

Perfect for short-run installations where the condenser and air handler are close together, this 16 ft. line set ensures a clean, reliable, and leak-proof connection. Whether part of a single-zone 18K DIY mini split or a compatible multi-zone system, it’s the ideal choice for efficient performance and true DIY installation.

🔧 Key Features

• Length: 16 feet – ideal for tight installations or wall-mounted outdoor units

• Line Sizes: 1/4" liquid x 1/2" suction – specifically for 18K BTU indoor units

• Pre-Charged with R-454B Refrigerant – no vacuuming or field charging required

• Quick Connect Fittings – patented DIY connection system for leak-free installation

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

System Compatibility

• MRCOOL DIY® 5th Gen single-zone 18K units

• MRCOOL Multi-Zone Condensers: Multi2-18K, Multi3-27K, Multi4-36K, Multi5-48K
  (must match line set size to the 18K air handler for multi-zone applications)

✅ Installation Notes

• Ideal when indoor and outdoor units are located in close proximity

• For longer runs: use multiple pre-charged line sets, with line set couplers and longer Pro Cable (sold separately)

• Follow MRCOOL’s installation guidelines and torque specifications for proper sealing

MRCOOL DIY Direct is the USA’s most trusted source for MRCOOL systems, parts, and accessories. This 16 ft. pre-charged line set is the go-to choice for compact 18K installations, delivering efficiency, convenience, and professional-grade performance for the DIY installer.