Part of this kit — included in the price above.

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

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

MRCOOL| SKU: DIYCOUPLER-3858K75 In Stock

$341.00$429.0021% off

Payment plans

From $28.41/mo with shop Pay View sample plans

$9.47/mo with Paytomorrow Learn More SAVE NOW:

Amounts shown are maximums; actual savings depend on income, household size, utility, and program rules. Some programs require installation by a licensed or participating contractor and/or specific equipment efficiency ratings. Rebate data by Rewiring America. Not tax or legal advice — verify with the program before purchase. Questions? Call us at (888) 231-8920.

Optional accessories

Add common accessories before checkout.

Pre-order - Estimated shipping: 2 - 4 weeks
Free Delivery Aug 10-17 (Est.)Included
Add coverage
Add coverage

Choose optional coverage for your order.

Protection plan

Use your system worry-free for years to come

  • Comprehensive coverage for mechanical and electrical breakdowns, including power surges
  • Repairs covered 100% for the extended term — labor included, not just parts
  • Coverage for normal wear and tear that affects how the product works
  • Replacement or reimbursement if we can’t repair it
  • $0 deductibles, ever
  • Cancel anytime on a pro-rata basis
  • US-based support and quick claims filing
2 Year Protection Plan · $29Add two years of optional service contract coverage. 5 Year Protection Plan · $59Add five years of optional service contract coverage.

Coverage begins after the manufacturer warranty applies, and runs alongside it for items the factory doesn’t cover. Select a plan above the Add to Cart button to include it with your order.

Backed by Chill Mini Splits · (888) 231-8920Detailed terms and conditions

Not sure which system fits?

Get a free sizing and compatibility check from our HVAC experts—plus 5% off.

By submitting, you agree to receive sizing help and occasional marketing emails. Unsubscribe anytime.

Product overview

 

MRCOOL 75ft Coupler Kit for DIY Line Sets 24K, 36K & 48K Air Handlers - 3/8" x 5/8"

With the 75ft MRCOOL DIY Coupler Kit, you can connect three line sets together and extend the length of the lineset. You can add three 16ft linesets together, three 25ft linesets together, or a combination of 16ft and 25ft linesets together. (If you only need to connect two linesets together, make sure to get the 50ft Coupler Kit also sold on our website!

The DIYCOUPLER-3858K75 product includes two of the DIYCOUPLER-38 and two of the DIYCOUPLER-58 (3/8" x 5/8" coupler) with 75 ft of communication wire.

To install the coupler kit, just disconnect the 25 foot wire pre-attached to your indoor unit and replace it with the new 75 foot wire. This product is intended for use with 24,000 or 36,000 BTU indoor wall units, but we also sell the coupler kit for the 9,000, 12,000, and 18,000 BTU indoor wall units.


Ask AI

Ask AI about this product

Ask our AI product assistant about sizing, compatibility, electrical needs, accessories, shipping, warranty, and install planning.