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mrcool|SKU:MC16-1438-var-53494-a13b70

MRCOOL Flare Line Set Kit — Secure Refrigerant Connections for Advantage and Olympus Mini Splits

Leak-Free Connections for Reliable Off-Grid Climate Control

Flared ends seal tight — Secure, leak-free refrigerant connections
Three lengths available — 16, 25, or 50 ft to match your install
Size-matched line diameters — Correct fit for 9K through 36K handlers
Complete kit included — Lines, communication wire, and drain hose
  • Free Shipping -- Ships free on all orders, no minimum
  • 30-Day Performance Guarantee -- Uninstalled returns accepted, full refund

Price range: $106.95 through $288.95

Add to Cart
MRCOOL Flare Line Set Kit for Advantage and Olympus Mini Split
MRCOOL Flare Line Set Kit for Advantage and Olympus Mini Split
$106.95 – $288.95Price range: $106.95 through $288.95

30-day money back · No restocking fee

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4.9/5 Stars 2,400+ verified reviews.

In the box

  • Liquid line
  • Suction line
  • Communication wire
  • Drain hose
MRCOOL Flare Line Set Kit for Advantage and Olympus Mini Split
MRCOOL Flare Line Set Kit — Secure Refrigerant Connections for Advantage and Olympus Mini Splits
$106.95 – $288.95Price range: $106.95 through $288.95

Leak-Free Connections for Reliable Off-Grid Climate Control

This MRCOOL flare line set delivers field-tested liquid and suction refrigerant lines built to keep your off-grid climate system running without leaks or failures. Flared ends guarantee a secure, sealed connection, while the included communication wire and drain hose cut down on install time. Available in 16, 25, or 50-foot lengths to match your exact layout, it's built-to-survive the demands of remote cabins, homesteads, and grid-independent living. Compatible with MRCOOL Advantage and Olympus mini-split systems.

FREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORT
Flared End Connections
Communication Wire Included
Drain Hose Included
3 Length Options Available
16 / 25 / 50 ft
Available Lengths
4
Components Included
9K / 12K / 18K / 24K / 36K
Supported BTU Sizes
No Mix-and-Match Guesswork on Diameters

No Mix-and-Match Guesswork on Diameters

The most common installation failure with mini-split line sets is buying the wrong diameter for your air handler size — 1/4" x 1/2" lines on a 36K unit starve the system, while oversized lines waste refrigerant charge. This MRCOOL flare line set eliminates that risk with size-specific pairings: 9K units get 1/4" x 3/8", 12K and 18K get 1/4" x 1/2", and 24K or 36K systems get 3/8" x 5/8". At Off Grid Vault, every component we carry is pre-vetted for compatibility — the same standard we apply to complete off-grid power systems. You don't have to cross-reference charts and hope you got it right.

Flared Ends Hold Tight Through Temperature Swings

Flared Ends Hold Tight Through Temperature Swings

Off-grid and remote installations subject your mini-split to wider temperature extremes than a climate-controlled suburban home. Flared connections create a metal-to-metal seal that holds under thermal expansion and contraction — unlike compression fittings that can loosen over seasons. This line set uses heavy-duty flared ends on both the liquid and suction lines, so your refrigerant stays where it belongs for the long haul. No slow leaks, no annual recharge rituals, no performance drop after the first winter. For a grid-independent setup, that kind of reliability isn't optional — it's the baseline.

Communication Wire and Drain Hose Included — One Order, No Missing Parts

Communication Wire and Drain Hose Included — One Order, No Missing Parts

Nothing stalls a mini-split install faster than realizing you're missing the communication wire or the drain hose and the nearest supplier is 45 minutes away. This kit bundles the liquid line, suction line, communication wire, and drain hose together — exactly what your MRCOOL Advantage or Olympus system requires. Available in 16, 25, or 50 foot lengths, you can match the line set to your actual indoor-to-outdoor distance without overbuying or splicing. At Off Grid Vault, we know that off-grid proven installations depend on getting the details right the first time. This kit delivers that.

System Compatibility

Verify your MRCOOL mini-split specs before ordering to ensure a correct match.

  • MRCOOL Advantage or Olympus mini-split system installed
  • Air handler rated at 9K, 12K, 18K, 24K, or 36K BTU
  • Distance between indoor and outdoor units ≤ selected line set length

Where This Line Set Performs

Designed for mini-split installations where reliability and a clean setup matter.

Off-Grid Cabin Climate Control
Homestead Workshop Cooling
Remote Tiny Home HVAC

Full specifications

At a glance

Dimensions
9K (1/4" x 3/8"), 12K or 18K (1/4" x 1/2"), 24K or 36K (3/8" x 5/8")
Full specifications4 data points across 4 categories

Dimensions

Available Lengths16 ft, 25 ft, 50 ft

Power & Performance

Air Handler Sizes9K (1/4" x 3/8"), 12K or 18K (1/4" x 1/2"), 24K or 36K (3/8" x 5/8")

Materials

DetailsSee product page

Compliance & Warranty

DetailsSee product page

The Off Grid Vault Promise

Every product we carry is vetted for real-world performance. This line set is no exception.

Free ShippingShips free to your door — no minimums, no fine print.
30-Day Performance GuaranteeIf it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days.
Authorized DealerGenuine MRCOOL components with full manufacturer warranty support handled through us.
★★★★★
“Installed this line set on my MRCOOL 18K Olympus in my 800 sq ft cabin. Flared ends sealed clean on the first try — no leaks after a full summer of cooling. Having the communication wire and drain hose in the same box saved me a trip to town. 25 feet was the perfect length for my wall penetration.”
F
First L.Prescott, AZ

This MRCOOL flare line set delivers heavy‑duty liquid and suction refrigerant lines ready for professional mini‑split installations. Flared ends ensure a secure, leak‑free connection, while the included communication wire and drain hose simplify setup. Choose from lengths of 16, 25, or 50 feet to match any Advantage or Olympus system. Built for durability, it streamlines the install process and keeps performance on point.

Line Set Type Flared
Included Components Liquid line, suction line, communication wire, drain hose
Available Lengths 16 ft, 25 ft, 50 ft
Air Handler Sizes 9K (1/4″ x 3/8″), 12K or 18K (1/4″ x 1/2″), 24K or 36K (3/8″ x 5/8″)
Product Type Accessories

Additional information

Air Handler Size

12K or 18K (1/4" x 1/2"), 24K or 36K (3/8" x 5/8"), 9K (1/4" x 3/8")
Length

16 Ft, 25 Ft, 50 Ft

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Frequently Asked Questions

Match the line set diameter to your air handler BTU rating. 9K units require 1/4" x 3/8" lines. 12K and 18K units need 1/4" x 1/2". 24K and 36K systems require 3/8" x 5/8" lines. Using the wrong diameter restricts refrigerant flow and degrades cooling or heating performance. If you are unsure which size your system needs, contact us with your model number and we will confirm the correct pairing before you order.
Yes, but longer runs require additional refrigerant charge to compensate for the extra volume inside the lines. Excess coiled line should be arranged neatly — never kinked or tightly bent. For runs approaching the 50-foot maximum, verify your MRCOOL system's maximum line length specification in the installation manual. If you need help calculating charge adjustments for longer runs, our team can walk you through it.
This line set is designed and specified for MRCOOL Advantage and Olympus mini-split systems. While flared line sets share common sizing standards, we recommend using the line set specified by your equipment manufacturer to ensure correct diameter matching and flared fitting compatibility. Using mismatched components introduces risk that we cannot stand behind.
Big-box retailers stock line sets as generic inventory with no guidance on diameter matching or system compatibility. You are on your own to figure out whether 1/4" x 1/2" or 3/8" x 5/8" is correct for your unit. At Off Grid Vault, we vet every component we carry and provide pre-purchase support to make sure you get the right part. If it does not work as specified, our 30-day performance guarantee has you covered.
No. This line set ships dry — it is a piping and wiring assembly only. Refrigerant is charged into the system during installation by a qualified HVAC technician after the lines are connected and the system is pressure-tested. Pre-charged line sets exist for some DIY mini-splits, but this flare line set is designed for standard professional installation procedures.
Off Grid Vault offers a 30-day performance guarantee. If the line set arrives and does not match your system requirements, you can return it uninstalled and in original packaging for a full refund. We ship free on all orders, so there are no hidden freight costs to factor into your decision. For installed components, warranty claims are handled through us as an authorized dealer.
SKU: MC16-1438 Category: Brand:

The Off Grid Vault Promise

Every product we carry is vetted for real-world performance. This line set is no exception.

Free Shipping Ships free to your door — no minimums, no fine print.
30-Day Performance Guarantee If it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days.
Authorized Dealer Genuine MRCOOL components with full manufacturer warranty support handled through us.

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