MRCOOL DIYCOUPLER-38 + DIYCOUPLER-58 w/ 75 Ft. of Communication Wire for 24K & 36K Line Set

MRCOOL DIYCOUPLER-38 + DIYCOUPLER-58 w/ 75 Ft. of Communication Wire for 24K & 36K Line Set

The MRCOOL DIY Coupler 3/8″ & 5/8″ with 75 ft Communication Wire (DIYCOUPLER-3858K75) is a connection accessory designed to extend and join pre-charged Quick Connect® line sets for MRCOOL DIY mini-split HVAC systems. It provides secure couplers for both the 3/8″ liquid line and 5/8″ suction line, allowing you to connect or extend line sets for larger installation distances while maintaining a sealed refrigerant path — all without needing vacuuming or refrigerant charging during installation.

Included with the couplers is a 75 ft MC-5 communication and power cable, giving you ample reach to connect the indoor air handler and outdoor condenser for models compatible with 24K and 36K BTU line sets. This extended communication wire provides greater flexibility in positioning the units, making it useful for installations where the condenser and air handler are farther apart than a standard line set allows.

Built to work specifically with MRCOOL DIY systems that use 24K and 36K BTU indoor units, this coupler and cable kit supports efficient and reliable system communication and control over greater distances. Its DIY-friendly design streamlines installation by reducing complexity and eliminating the need for specialized HVAC tools.

Whether extending line sets or creating custom placements for your mini-split system, the MRCOOL DIY Coupler 3/8″ & 5/8″ with 75 ft Communication Wire offers a practical solution that enhances installation flexibility and helps maintain consistent system performance.

Features

• System Compatibility – Designed for MRCOOL DIY 24K & 36K systems and VersaPro mini splits up to 2.5 Ton. Ensures a reliable and compatible connection with your setup.
• Dual Coupler Sizes – Includes both 3/8” and 5/8” couplers for a tight, leak-resistant seal and secure extension of the line set.
• Extended Communication Range – Comes with 75 feet of communication wire, giving you the flexibility to span greater distances between indoor and outdoor units.
• Refrigerant Integrity Maintained – Preserves the efficiency of prefilled line sets without requiring vacuuming or refrigerant charging.
• Quick Connect Installation – Uses MRCOOL’s DIY Quick Connect® technology, allowing fast, easy, and secure coupler connections for a hassle-free install.

Applications

• Extended Installations – Ideal when the standard MRCOOL line set is too short for the setup

• Large Structures – Perfect for bigger homes, barns, or detached garages needing extra distance

• Multi-Zone Use – Supports split or multi-room applications requiring longer line spans

• System Expansion – Makes it easy to extend the reach of DIY or VersaPro installations

• Flexible Layouts – Adapts to unique home designs, remodels, or retrofits with distance challenges

What’s Included

• DIYCOUPLER-38 (3/8” Coupler)

• DIYCOUPLER-58 (5/8” Coupler)

• 75 Ft. of Communication Wire
  

Frequently-Asked Questions

Can I use this with any MRCOOL system?
This kit is specifically designed for MRCOOL DIY 24K & 36K systems and VersaPro units up to 2.5 Ton. It is not compatible with smaller units or non-DIY systems.

Does it come with refrigerant?
No refrigerant is needed. The couplers are designed to work with pre-charged line sets and maintain refrigerant seal integrity when connected properly.

Do I need a vacuum pump to install this?
No. This is a vacuum-free installation when used with compatible MRCOOL prefilled line sets. It’s intended to keep installation quick and simple.

Can I install this myself?
Yes, if you're comfortable with MRCOOL DIY systems. However, if you're unsure, it's always a good idea to have an HVAC professional assist, especially to ensure leak-proof connections and warranty protection.

Manual

• Installation Manual