Mr Cool Coupler for DIY 24k and 36k units

MRCOOL 75ft Coupler Kit for DIY Line Sets 24K, 36K & 48K Air Handlers

The DIYCOUPLER-3858K75 MRCOOL 75 ft Coupler Kit for DIY Line Sets (3/8" × 5/8") is an HVAC line set extension coupler kit that lets you connect up to three MRCOOL DIY line sets together to extend total run length. It includes both the 3/8" and 5/8" couplers plus 75 ft of communication wire, allowing you to replace the shorter pre-attached indoor-unit wire and match the extended line set length for compatible MRCOOL DIY systems.

Country of Origin: Varies by production batch

Key Features / Specifications

• Model / Part Number: DIYCOUPLER-3858K75
• Brand: MRCOOL
• Product Type: DIY line set coupler kit + communication wire
• Line Set Sizes: 3/8" × 5/8"
• Total Wire Length Included: 75 ft communication wire
• Couplers Included: (2) DIYCOUPLER-38 and (2) DIYCOUPLER-58 (3/8" and 5/8" couplers)
• Extension Capability: Connect three line sets together (e.g., three 16 ft, three 25 ft, or a mix of 16 ft and 25 ft)
• Compatibility (as stated): Intended for 24,000 or 36,000 BTU indoor wall units; marketed for DIY line sets used with 24K, 36K & 48K air handlers
• Installation Note: Replace the indoor unit’s pre-attached wire (example noted as 25 ft) with the included 75 ft wire when extending line sets
• Related Option: If only connecting two line sets, a 50 ft coupler kit is referenced as the alternative

Ideal For

• Extending MRCOOL DIY line set runs by coupling multiple line sets together
• Installations where the indoor/outdoor distance requires more than a single line set length
• Systems using 3/8" liquid and 5/8" suction lines that need matched couplers
• DIY installs needing the included 75 ft communication wire to match the longer run