Fortress 4.5" Coupler – LJ122W (White) | Lineset Cover Connector | MRCOOL Compatible

The Fortress 4.5" Coupler – LJ122W is designed to securely join two sections of 4.5" lineset cover ducting, creating a clean, continuous run for HVAC refrigerant lines, drain hoses, and control wiring. This fitting is an essential component for any extended installation where additional duct length is needed.

Part of the Fortress LD122 Series, this coupler is fully compatible and interchangeable with MRCOOL® LineGuard, making it a reliable choice for both new installs and upgrades on mini-splits, heat pumps, and central HVAC systems.

Constructed in the USA from UV-stabilized, weather-resistant PVC, the LJ122W offers long-term durability against sun exposure and harsh outdoor conditions. Its snap-together design allows for fast installation and provides a tight, secure fit to help prevent pest intrusion. The white finish is paintable, allowing for a seamless match to siding, trim, stucco, or commercial surfaces.

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Key Features

• 4.5" LD122 Coupler / Connector
  Connects two straight duct sections for longer lineset runs.

• MRCOOL LineGuard Compatible
  Works seamlessly with MRCOOL®, Daikin, GREE, and most major lineset cover systems.

• Durable, Weather-Resistant PVC
  UV-stabilized to withstand sun, rain, and extreme temperatures.

• Snap-Together Design
  Fast installation with a secure, tight fit.

• Pest-Resistant Surface Fit
  Helps prevent insects or debris from entering duct channels.

• Paintable Finish
  Easily color-match to any building exterior.

• Made in the USA
  Quality construction built for American climate conditions.

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Specifications

• Brand: Fortress / Rectorseal

• Model / MPN: LJ122W (SKU 84110)

• Series: LD122 – 4.5"

• Type: Lineset Cover Coupler / Connector

• Color: White

• Material: UV-Stabilized PVC

• Warranty: 12-Month Manufacturer Guarantee

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Applications

Perfect for:

• Extending lineset cover runs

• Mini-split installations

• Heat pump systems

• Central A/C systems

• Residential & commercial HVAC

• MRCOOL DIY & Pro systems