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mrcool|SKU:DIYCOUPLER-3858K75

MRCOOL DIYCOUPLER-3858K75 — 3/8-Inch and 5/8-Inch Quick Connect Coupler Kit with 75 ft Communication Wire

When the Line Set Runs Short, the Job Doesn't Stop

Elevate your outdoor grilling setup with the precision-engineered DIYCOUPLER-38 and DIYCOUPLER-58, expertly paired with 75 feet of communication wire for seamless connectivity. Designed for those who demand flexibility, these couplers allow you to extend your QUICK CONNECT line sets effortlessly, ensuring your premium cooking equipment operates at peak performance. Experience unmatched convenience and reliability as you customize your outdoor kitchen to perfection.

Extends any line run — Join two standard Quick Connect sets for longer installation distances
Two coupler sizes, one kit — 3/8-inch and 5/8-inch both included for complete line set compatibility
75 ft wire included — Match your extended run without hunting for additional communication wire
Fits 9K through 18K — Works with 9,000, 12,000, and 18,000 BTU MRCOOL DIY air handlers
  • FREE Shipping -- Free on qualifying orders — call for freight details on this item
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$168.32

10 in stock

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DIYCOUPLER-38 + DIYCOUPLER-58 (Two Sets) w/75 ft of Communication Wire - DIYCOUPLER-3858K75
DIYCOUPLER-38 + DIYCOUPLER-58 (Two Sets) w/75 ft of Communication Wire - DIYCOUPLER-3858K75
$168.32

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In the box

  • 1× DIYCOUPLER-38 (3/8-inch coupler set)
  • 1× DIYCOUPLER-58 (5/8-inch coupler set)
  • 75 ft communication wire
DIYCOUPLER-38 + DIYCOUPLER-58 (Two Sets) w/75 ft of Communication Wire - DIYCOUPLER-3858K75
MRCOOL DIYCOUPLER-3858K75 — 3/8-Inch and 5/8-Inch Quick Connect Coupler Kit with 75 ft Communication Wire
$168.32

When the Line Set Runs Short, the Job Doesn't Stop

Most MRCOOL DIY installations hit the same wall: the standard Quick Connect line set reaches just far enough — until it doesn't. When your air handler and outdoor unit are farther apart than one line set covers, you don't pull permits and start over. You grab the DIYCOUPLER-3858K75. This vetted MRCOOL kit gives you both coupler sizes in one package, plus 75 feet of communication wire, so your wiring doesn't run short while you're solving the refrigerant side. One kit, one order, one complete extension.

FREE SHIPPING $200+30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING $200+30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING $200+30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING $200+30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING $200+30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING $200+30-DAY RETURNSEXPERT SUPPORT
DIY-ready install
Fits 9K–18K units
Ships in one box
75 ft wire included
75 ft
Communication wire in the box
2
Coupler sizes — 3/8-inch and 5/8-inch
3
Compatible unit sizes: 9K, 12K, 18K
Stop Guessing at the Hardware Store — Both Couplers, Paired and Ready

Stop Guessing at the Hardware Store — Both Couplers, Paired and Ready

Big-box staff can't tell you whether to buy the 3/8 or the 5/8 coupler for your mini-split run — they don't stock MRCOOL-vetted components to begin with. The DIYCOUPLER-3858K75 eliminates that guesswork entirely. We sell what we'd put in our own install: both coupler sizes engineered specifically for MRCOOL Quick Connect line sets, packed together, with 75 feet of communication wire so every component of your extension arrives in one shipment. Curated for the DIY builder who doesn't want to make two trips or place two orders.

Copper Fittings Engineered for MRCOOL's Quick Connect System — Not Generic Adapters

Copper Fittings Engineered for MRCOOL's Quick Connect System — Not Generic Adapters

The 3/8-inch and 5/8-inch couplers in this kit are MRCOOL factory components, not generic adapters from a plumbing aisle. They're designed to mate precisely with MRCOOL DIY Quick Connect line sets, ensuring a leak-free refrigerant path when two sets are joined end to end. Copper construction holds up under the pressure cycling every mini-split produces across years of use. Whether your outdoor unit sits 50 feet from the air handler or 80 feet, this coupler kit handles the extension without improvisation or field modifications.

Communication Wire That Matches the Run — Because Your Signal Line Matters Too

Communication Wire That Matches the Run — Because Your Signal Line Matters Too

Most coupler kits forget the wire. The DIYCOUPLER-3858K75 ships with 75 feet of communication wire — enough to match your extended line set run without splicing, taping, or improvising with whatever's in your garage. The communication wire carries the signal between your MRCOOL air handler and outdoor unit; a clean, continuous run keeps the system responsive and eliminates nuisance fault codes. When you're making a real investment in a backyard comfort system, getting the installation right the first time is worth more than saving fifteen dollars on wire.

Will it fit your system?

Check your air handler BTU rating before ordering — this kit covers the three standard MRCOOL DIY line set sizes

  • 9K (9,000 BTU) DIY air handlers
  • 12K (12,000 BTU) DIY air handlers
  • 18K (18,000 BTU) DIY air handlers

When One Line Set Isn't Enough

The DIYCOUPLER-3858K75 solves the most common DIY mini-split installation challenge

Long-distance unit placement
Multi-zone DIY installs
Outdoor kitchen HVAC runs
Retrofits into existing structures

Full specifications

At a glance

Dimensions
11 in
Warranty
See manufacturer documentation
Full specifications17 data points across 4 categories

Dimensions

Net Weight10.80 lbs
Gross Weight12.12 lbs
Gross Depth22.5 in
Gross Height4.5 in
Gross Width11 in

Power & Performance

Communication Wire Length75 ft
Coupler Sizes Included3/8-inch and 5/8-inch
Compatible Air Handler Sizes9K, 12K, 18K BTU

Materials

ColorCopper
Color FamilyBronze/Copper Metallic
Contains ElectronicsNo
Contains ChemicalsNo
Contains Compressed GasNo

Compliance & Warranty

Proposition 65 WarningYes
Restricted StatesGU, PR, VI
Registered WarrantySee manufacturer documentation
Freight Class77.5

The Grill Island Promise

Every MRCOOL component we carry is genuine, authorized, and backed by real support — not a marketplace guess

Authorized MRCOOL DealerGenuine factory components with full manufacturer support on every order
30-Day Money-BackUnused returns accepted within 30 days, free return freight on us
Expert Install SupportTalk to a real expert before or after your purchase — phone, chat, or email
★★★★★
“Ran my MRCOOL across the garage — one line set wasn't going to reach. Both coupler sizes in one kit, plus the 75 feet of wire was enough to cover the whole run without any splicing. Exactly what I needed and it arrived fast.”
M
Mike T.Nashville, TN

DIYCOUPLER-38 + DIYCOUPLER-58 (Two Sets) w/75 ft of Communication Wire – DIYCOUPLER-3858K75

Maximize the reach of your DIY® QUICK CONNECT® line sets with the DIYCOUPLER-38 + DIYCOUPLER-58 (Two Sets) w/75 ft of Communication Wire. Designed for premium HVAC installations, this coupler kit allows you to seamlessly combine two standard QUICK CONNECT® line sets when a single set isn’t sufficient. Ideal for 9K, 12K, or 18K air handlers, this solution provides the flexibility to extend your system’s reach without compromising performance. Crafted from durable copper with a bronze/copper metallic finish, it’s built to deliver reliable, long-lasting connectivity. Plus, with 75 feet of communication wire included, you have everything you need for a professional-grade installation.

Key Features

  • Extended Reach: Combine two standard QUICK CONNECT® line sets to achieve the desired length for your installation.
  • Compatible with 9K, 12K, and 18K Air Handlers: Specifically designed to work with these popular system sizes.
  • Complete Kit: Includes two couplers (DIYCOUPLER-38 and DIYCOUPLER-58) plus 75 feet of communication wire for a hassle-free setup.
  • Premium Copper Construction: High-quality copper material ensures excellent conductivity and durability.
  • Bronze/Copper Metallic Finish: Aesthetically pleasing and corrosion-resistant for long-term reliability.
  • No Batteries or Electronics Required: Simple mechanical coupling with no additional power or electronic components needed.
  • Proposition 65 Compliant: Includes necessary warning for California residents.

Specifications

  • Color: Copper
  • Color Family: Bronze/Copper Metallic
  • Registered Warranty: N/A
  • Has Batteries: No
  • Contains Electronics: No
  • Contains Chemicals: No
  • Contains Aerosol: No
  • Contains Compressed Gas: No
  • Proposition 65 Warning: Yes
  • Restricted States: GU; PR; VI
  • Net Weight: 10.80 lbs
  • Gross Depth: 22.5 inches
  • Gross Height: 4.5 inches
  • Gross Width: 11 inches
  • Gross Weight: 12.12 lbs
  • Freight Class: 77.5
  • Product Manuals: Install Manuals (PDF)

Why Choose DIYCOUPLER-38 + DIYCOUPLER-58 (Two Sets) w/75 ft of Communication Wire – DIYCOUPLER-3858K75

When your standard QUICK CONNECT® line set isn’t long enough, the DIYCOUPLER-3858K75 is the ultimate solution. This kit is engineered for professionals and DIY enthusiasts who demand flexibility without sacrificing quality. The copper construction ensures optimal performance, while the included 75 feet of communication wire saves you time and money by eliminating the need for separate purchases. Whether you’re installing a 9K, 12K, or 18K air handler, this coupler set provides the reliable connection you need to extend your system’s reach. Trust in a product designed to integrate seamlessly with your existing DIY® QUICK CONNECT® line sets, delivering a premium installation experience every time.

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Frequently Asked Questions

This kit includes two couplers (DIYCOUPLER-38 and DIYCOUPLER-58) and 75 feet of communication wire. It is designed to combine two standard DIY QUICK CONNECT LINE SETS when a single set is not long enough, effectively increasing the overall length of your line set connection.
The DIYCOUPLER is compatible with 9K, 12K, and 18K air handlers. It is designed for use with standard DIY QUICK CONNECT LINE SETS to extend their reach. Always verify that your air handler model matches these specifications before purchase.
No, this product does not contain batteries, electronics, chemicals, aerosols, or compressed gas. It is a purely mechanical coupler kit made of copper with a bronze/copper metallic finish, along with communication wire for connecting line sets.
The net weight is 10.80 lbs, with a gross weight of 12.12 lbs. The package dimensions are 22.5 inches deep, 4.5 inches high, and 11 inches wide. The freight class is 77.5. Note that shipping to restricted states (GU, PR, VI) is not available.
The registered warranty for this product is listed as N/A. For specific warranty or support inquiries, please contact our customer service team. We recommend reviewing the product manual for detailed installation and usage guidelines.
The couplers are made of copper and require minimal maintenance. Keep them clean and dry to prevent corrosion. The communication wire should be handled carefully to avoid damage. For best performance, follow the installation manual provided in the product documentation.
Return and support policies are not specified in the product data. We recommend checking our store's return policy or contacting customer support for details. This product is intended for use with DIY QUICK CONNECT LINE SETS and should be installed by a qualified professional.
This kit is for users who need to extend the length of two standard DIY QUICK CONNECT LINE SETS for 9K, 12K, or 18K air handlers. It is ideal for DIY enthusiasts or professionals installing HVAC systems where longer line set runs are required, such as in larger homes or commercial spaces.
SKU: DIYCOUPLER-3858K75 Categories: , Brand:

The Grill Island Promise

Every MRCOOL component we carry is genuine, authorized, and backed by real support — not a marketplace guess

Authorized MRCOOL Dealer Genuine factory components with full manufacturer support on every order
30-Day Money-Back Unused returns accepted within 30 days, free return freight on us
Expert Install Support Talk to a real expert before or after your purchase — phone, chat, or email

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