MRCOOL DIY Line Set Coupler Kit (DIYCOUPLER-3858K75C) – 75' Extended Connection Solution

When a standard 25-foot line set is insufficient for your installation layout, the DIYCOUPLER-3858K75C provides the specialized hardware required to expand your system's reach. This kit is the ideal solution for larger homes or complex floor plans that demand extra distance between the indoor air handler and the outdoor condenser without compromising the sealed refrigerant system.

Engineered specifically for MRCOOL DIY systems using 24k or 36k air handlers, this MRCOOL DIY line set coupler kit allows two separate pre-charged line sets to be joined together seamlessly. To utilize this extension, a second pre-filled line set must be purchased separately. While the kit ensures the combined refrigerant path remains secure, it is vital to maintain peak performance by ensuring the total length for any single zone does not exceed 75 feet.

The primary benefit of this MRCOOL DIY line set coupler kit and 75' control wire extended connection kit is the inclusion of the 75-foot MC5 Pro Cable, which provides a continuous electrical connection. Instead of splicing shorter wires together, users replace the standard 25-foot cable with this longer version for a reliable, uninterrupted signal. The DIYCOUPLER-38 and DIYCOUPLER-58 components provide simple, leak-proof mechanical connections, preserving the user-friendly QUICK CONNECT system and eliminating the need for professional brazing or vacuuming.

By providing all necessary hardware in one package, this kit reduces installation complexity. It ensures the project remains within manufacturer specifications, resulting in a reliable, factory-standard setup that protects the system's efficiency and longevity.

Product Highlights