MRCOOL DIY® 5th Gen 25 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set (for 6K - 9k - 12k Indoor Units)

MRCOOL DIY® 5th Gen 25 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set (for 6K - 9K - 12K Indoor Units)

The MRCOOL DIY® 5th Generation 25 ft. Pre-Charged Line Set is the standard line length for 6,000 -9,000 - 12,000 BTU mini split air handlers. Featuring 1/4" liquid and 3/8" suction lines, this set is pre-charged with R-454B refrigerant and uses MRCOOL’s patented Quick Connect fittings to ensure a safe, tool-free installation without the need for vacuum pumps or gauges.

Built for performance, flexibility, and ease of use, this 25 ft. line set is ideal for MRCOOL 5th Gen single-zone systems with 9K - 12K heads or multi-zone systems where one of the zones includes a 6,000 BTU air handler.

🔧 Key Features

• Length: 25 feet – standard length for most mini split installs

• Line Sizes: 1/4" liquid line x 3/8" suction line – tailored for 6K - 9K - 12K indoor units

• Pre-Charged with R-454B – Environmentally friendly refrigerant sealed at the factory

• Quick Connect Fittings – Designed for easy, leak-free DIY installation

• Durable & Flexible – White UV-resistant sleeve with insulated copper tubing

• System Compatibility:

  • MRCOOL DIY® 5th Gen 6K single-zone systems

  • MRCOOL Multi-Zone DIY Systems: Multi3-18K, Multi4-27K, Multi5-36K, Multi6-48K, Multi6-55K 
    (Ensure line set size matches indoor air handler BTU rating in multi-zone installs)

✅ Installation Notes

• This is the standard line set length included with most 9K single-zone systems.

• Need more length? Use couplers and extended control wire (Pro Cable sold separately).

• Follow MRCOOL installation instructions for torque values and setup guidance to preserve your warranty.

Shop with confidence at MRCOOL DIY Direct — the most trusted source for MRCOOL HVAC systems, genuine accessories, and expert support. This 25 ft. line set is your go-to solution for reliable, straightforward DIY installation.