MRCOOL DIY 5th Gen 50 Ft. Pre-Charged Quick Connect Line Set with DIY Pro Cable, 1/4" x 3/8", for DIY 6K, 9K, & 12K Mini Split Indoor Air Handler
The MRCOOL DIY® 5th Gen 50 ft Pre-Charged Quick Connect Line Set (1/4″ x 3/8″) is a ready-to-install refrigerant line set designed to simplify and extend the installation between your indoor and outdoor mini-split units. It is factory pre-charged with eco-friendly R-454B refrigerant and equipped with MRCOOL’s patented Quick Connect® fittings, which eliminate the need for vacuum pumps, refrigerant charging, or specialized HVAC tools during setup — making it ideal for DIY installations.
With a 50-foot length, this line set offers excellent flexibility for longer installation distances, whether the indoor and outdoor units are placed across larger rooms, between floors, or in separate structures. It features a 1/4″ liquid line and a 3/8″ suction line and is specifically engineered for MRCOOL 5th Gen 6K, 9K, and 12K BTU indoor air handlers to ensure proper performance and compatibility.
The line set is built with durable, weather-resistant insulation and robust fittings that protect the refrigerant lines from outdoor elements and UV exposure. This construction helps maintain reliable refrigerant flow and supports consistent system efficiency throughout the year.
Also included is a DIY Pro communication and power cable, providing a complete connection solution that supports both refrigerant and control wiring. With its pre-charged design, extended reach, and DIY-friendly Quick Connect technology, this line set is an excellent solution for homeowners and installers looking for a simple and reliable way to complete longer mini-split installations.
Features
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Pre-Charged Line Set – Comes sealed and factory pre-filled with R-454B refrigerant, eliminating the need for charging on-site.
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Extended Length – Offers 50 feet of line, providing flexibility for longer, more complex installations where units are placed far apart.
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Quick Connect Fittings – Equipped with tool-free, leak-proof connections that simplify the installation process for DIYers.
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Line Size Compatibility – Built for 1/4" x 3/8" connections, specifically suited for 6K, 9K, and 12K MRCOOL indoor units.
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DIY Pro Cable Included – Comes with a high-quality, weather-resistant communication and power cable for reliable system operation.
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Weather-Resistant Insulation – Features a durable outer jacket that protects against UV exposure, moisture, and outdoor conditions.
Specifications
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Series
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5th Gen DIY Line Set - R-454B
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| Compatible Air Handlers |
6K, 9K, & 12K 5th Gen DIY |
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Line Set Length
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50 ft
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| Lineset Fitting Type |
Quick-Connection |
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Gross Dimensions
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37.2" D x 4.92" H x 37.2" W
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Color
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White
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Color Family
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Bronze/Copper Metallic
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| Refrigerant Type |
R-454B
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Refrigerant Volume (Oz)
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6.07
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Liquid Line Size
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1/4
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Suction Line Size
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3/8
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Registered Warranty
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N/A
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Has Batteries
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No
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| Contains Electronics |
No |
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Contains Chemicals
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Yes
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Contains Aerosol
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Yes
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Contains Compressed Gas
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Yes
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Proposition 65 Warning
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Yes
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Restricted States
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GU;PR;VI
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Net Weight (Lbs)
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24
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Gross Weight (Lbs)
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29.5 |
Applications
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Compact system installations – Designed for use with 6K, 9K, and 12K MRCOOL indoor mini split air handlers
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Room-to-room expansion – Great for setups where units are spaced out across larger rooms or zones
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Multi-story buildings – Useful in homes or offices where the indoor and outdoor units are on different levels
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Detached buildings – Ideal for extending system reach to garages, sheds, or other exterior structures
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Custom layout flexibility – Supports installations that require a longer run without refrigerant loss
What’s Included
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50 Ft. Line Set (1/4" x 3/8")
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DIY Pro Communication and Power Cable
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Pre-installed Quick Connect fittings
Frequently-Asked Questions
Can I install this line set without a vacuum pump?
Yes. The MRCOOL Quick Connect® fittings allow for vacuum-free installation, preserving refrigerant integrity and simplifying the process.
What size systems is this compatible with?
This line set is designed for use with MRCOOL 5th Gen DIY 6K, 9K, and 12K BTU indoor air handlers.
Does it come pre-charged with refrigerant?
Yes. The line set is factory pre-charged with R-454B refrigerant, ready for use out of the box.
Can I use this for a different MRCOOL unit size?
No. This line set is only compatible with 6K–12K BTU MRCOOL DIY 5th Gen air handlers and should not be used with other capacities.
