MRCOOL DIYCOUPLER-58 + DIYCOUPLER-38 + 75ft MC-5 Cable, 5th Gen

The MRCOOL 5th Gen DIY Coupler Kit is the perfect solution when a single DIY® Quick Connect® Line Set just isn’t long enough. This kit allows you to seamlessly extend your refrigerant lines by combining two existing MRCOOL line sets—ideal for reaching farther outdoor unit installations. Designed for use with 24K and 36K air handlers, the kit includes both gas and liquid line couplers, plus a 75 ft. communication cable for uninterrupted signal and control.

MRCOOL DIYCOUPLER-58 + DIYCOUPLER-38 + 75ft MC-5 Cable Features

Easy Line Extension – Join two standard Quick Connect® Line Sets to create a longer, seamless connection.
Dual Coupler Compatibility – Includes both 3/8" liquid line and 5/8" gas line couplers.
Designed for DIY Installation – Tool-free connections make this a fast and reliable extension solution.
Heavy-Duty Insulation – Ensures minimal refrigerant loss and optimized system performance.
75 Ft. Communication Cable – Extended cable allows flexible placement of indoor and outdoor units.

MRCOOL DIYCOUPLER-58 + DIYCOUPLER-38 + 75ft MC-5 Cable Applications

• Extended Line Set Installations – Great for homes with outdoor units placed farther from the air handler.

• Custom DIY Projects – Useful when designing a system layout for unique architectural conditions.

• Retrofits & Renovations – Simplifies rerouting line sets around additions or newly built rooms.

• Garage and Basement Solutions – Easily accommodates units mounted in hard-to-reach or external areas.

• Multi-Room Configurations – Supports configurations needing greater installation flexibility.

What’s Included?

• 1 × 3/8" Liquid Line Coupler

• 1 × 5/8" Gas Line Coupler

• Insulation

• 1 × 75 Ft. MC-5 Communication Cable

MRCOOL DIYCOUPLER-58 + DIYCOUPLER-38 + 75ft MC-5 Cable Specifications

Frequently-Asked Questions

Can this kit be used with smaller air handlers like 12K or 18K?
No. This coupler kit is specifically designed for 24K and 36K air handlers. For smaller systems, refer to MRCOOL's compatible line extension kits.

Do I need a vacuum pump or special tools for this installation?
No. This is a true DIY-friendly kit—the Quick Connect® system means no vacuuming or brazing is needed.

Will this impact system performance?
Not if installed properly. The insulated couplers and factory-sealed connections ensure minimal loss and maintain system efficiency.

Is the communication cable pre-attached?
No. The 75 ft. communication cable comes separately and needs to be wired to your system during installation.

Manual

• MRCOOL DIYCOUPLER-58 + DIYCOUPLER-38 + 75ft MC-5 Cable, 5th Gen Manual