Skip to content

MRCOOL 75ft Line Set Coupler Kit for DIY Single Zone and Multizone 24K, 36K & 48K Air Handlers - 3/8" x 5/8"

Original price $230.00
Original price $230.00 - Original price $230.00
Original price $230.00
Save $46.00 Save $0.00
Current price $184.00
$184.00 - $184.00
Current price $184.00

Item Status : Limited Stock

Leaves Manufacturer's Warehouse in 2-3 Business Days. ETA Delivery 5-7 days. Easy 30 Day Returns.

Have Questions?

Talk to a Mr Cool DIY Expert Today

  • High Quality U.S Made Products
  • No Sale Tax (Exclusions Apply)
  • Free & Fast Delivery
  • Manufacturer Warranty Included

Upgrade Your Line Sets with MRCOOL DIY Coupler Kit

Are you looking to extend the reach of your HVAC system's line sets without the hassle of complicated installations? 

With this kit, you can seamlessly connect three line sets together, allowing you to extend their length as needed. Whether you have three 16ft linesets, three 25ft linesets, or a combination of both, this kit has you covered.

All in One Package: The DIYCOUPLER-3858K75 kit comes complete with two DIYCOUPLER-38 and two DIYCOUPLER-58 (3/8" x 5/8" coupler), along with 75ft of communication wire.


Installing the coupler kit is straightforward. Simply disconnect the existing 25ft wire attached to your indoor unit and replace it with the provided 75ft wire. It's that simple!

Compatibility: While specifically designed for use with 24,000 or 36,000 BTU indoor wall units, this kit is also compatible with 9,000, 12,000, and 18,000 BTU indoor wall units. So, no matter the size of your unit, you can benefit from the extended reach provided by this coupler kit.

Words From Our Happy Customers

Meet Our Experts

Meet Our Experts

Need help choosing the right products for your needs? Our team of highly trained experts has the knowledge and passion to help. Just pick up the phone and give us a ring. Or let's converse via live chat. We love assisting and lending a hand (or an ear).

UPS Ground Free Delivery

Direct to your door 2-7 business days or less

Secure Checkout

128-bits SSl secure online checkout

Easy Returns

Hassle-free returns on all orders 30 days or less

High-Quality Products

Nothing is more important to us than the quality of our products. Each of the manufacturers we work with have been vetted for quality, and we have personally visited manufacturing facilities to ensure high-quality production practices.

We Operate in the USA

Golden Age Hub services the 48 contiguous united states with high-quality luxury products. Our staff is entirely US-Based and our equipment ships directly out of warehouses on US soil.

Easy Refunds & Returns

If your equipment isn’t what you expected, we make refunds and returns quick and easy. Just email and we’ll take care of you from there.

Full Refund Policy

Fast, Safe Shipping

Orders from Golden Age Hub always ship with recognized LTL Freight Companies. We strive to ensure your equipment gets to you quickly, safely, and with no interruptions.

Full Shipping Details