Premium pre-insulated copper line set engineered for ductless mini-splits, heat pumps, and central air conditioning systems — optimized for performance, durability, and easy installation.
The Mini Split Air Conditioner Line Set is twin already. So buy it now.
Product Overview
The 3/8″ x 5/8″ mini split refrigerant line set is a twin copper pipe assembly with precision insulation, specially designed to connect indoor and outdoor HVAC units. It delivers excellent thermal efficiency and protects against condensation, corrosion, and environmental wear.
Key Features & Benefits
Standard 3/8″ x 5/8″ Copper Pipe Dimensions
This line set features industry standard tubing sizes (3/8″ liquid line and 5/8″ suction line) — equivalent to 9.52 mm and 15.88 mm outside diameter — ensuring compatibility with most mini-split systems.
99.9% Pure Copper Construction
Manufactured from high-purity copper that meets ASTM B280 and C12200 standards, our line set provides excellent heat transfer, high pressure tolerance, and long service life.
Advanced Insulation for Thermal Efficiency
Features premium UV-resistant polypropylene insulation that meets ASTM E84, UL94, ASTM D1056 and ASTM G21 standards. It maintains performance across a wide temperature range from -40 °C to 120 °C.
Wide HVAC Application
Ideal for ductless mini-splits, heat pumps, and centralized air conditioning systems. This line set enables efficient refrigerant flow and reliable system operation across commercial and residential installations.
High Pressure-Rated Performance
Pressure tested at 2100–7000 PSI, far exceeding the standard requirement for R410A refrigerant systems (700 PSI), ensuring safety and stability.
OEM & Customization Options
The insulation can be custom-printed with your company name, sizes, or branding for tailored OEM solutions.
Technical Specifications
Material: 99.9% Pure Copper (ASTM B280 & C12200)
Size: 3/8″ (liquid line), 5/8″ (suction line) O.D.
Insulation: High-density polypropylene, UV-resistant
Temperature Range: -40 °C to 120 °C
Pressure Rating: 2100–7000 PSI
Standards Compliance: ASTM E84, UL94, ASTM D1056, ASTM G21 (UV & flame/fire performance)
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Applications
Perfect for:
✔ Ductless mini split AC systems
✔ Heat pump lines
✔ Central HVAC installations
✔ Residential and commercial air conditioning projects
This line set connects evaporator coils to condenser units while maintaining optimal refrigerant flow and system performance.
Packaging & Shipping Options
Available in multiple lengths from 15m up to 50m, the line set is securely packaged and suitable for international shipping. OEM branding and customized packaging are also supported.
Mini Split Refrigerant Line Set for HVACR Applications Wholesaler & Supplier
DABUND PIPE in-house tested insulate copper pipe and tubing is designed to make installation simple and quick – saving you time and money on each job.
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Mini Split Refrigerant Line Set
Size | Length | Insulation White PE | Flame Resistant |
1/4+3/8 | 15m/20m/25m/30m/50m | 8mm/9mm/10mm/13mm/19mm/25.4mm | M1/B1 |
1/4+1/2 | 15m/20m/25m/30m/50m | 8mm/9mm/10mm/13mm/19mm/25.4mm | M1/B1 |
1/4+5/8 | 15m/20m/25m/30m/50m | 8mm/9mm/10mm/13mm/19mm/25.4mm | M1/B1 |
3/8+5/8 | 15m/20m/25m/30m/50m | 8mm/9mm/10mm/13mm/19mm/25.4mm | M1/B1 |
3/8+3/4 | 15m/20m/25m/30m/50m | 8mm/9mm/10mm/13mm/19mm/25.4mm | M1/B1 |
1/2+3/4 | 15m/20m/25m/30m/50m | 8mm/9mm/10mm/13mm/19mm/25.4mm | M1/B1 |
3/8+7/8 | 15m/20m/25m/30m/50m | 8mm/9mm/10mm/13mm/19mm/25.4mm | M1/B1 |
1/4 + 3/8 Mini split refrigerant line set used for 0.75TON - 1.0TON mini split air conditioner.
1/4 + 1/2 Mini split line set used for 1.5TON - 2.0TON mini split air conditioning.
1/4 + 5/8 Copper line set used for 2.0TON - 2.5TON split air conditioner system.
3/8 + 5/8 Insulated copper tube apply for 3.0TON - 4.0TON ductless mini split air conditioner.
3/8 + 3/4 Insulated copper tubing used for 4.5TON - 6.0TON split air conditioner installation.
3/8 + 7/8 Insulated copper piping apply for 6.0TON - 8.0TON ductless mini split air conditioner.
Air conditioning copper line sets 1/4 + 3/8 used for 0.75P and 1P split air conditioning.
Copper pipe kit 1/4 + 1/2 commonly used for 1.5P and 2P mini split air conditioners.
1/4 + 5/8 Insulated copper line set used for 2P and 2.5air conditioner system.
3/8 + 5/8 Mini-split copper line set apply for 3P and 4P ductless mini split air conditioner.
3/8 + 3/4 Copper pipe kit used for 4.5P and 6P split aircon installation.
3/8 + 7/8 Insulated copper piping apply for 6P - 8p TON ductless mini split air conditioner.
1/4 + 3/8 Mini split line set used for 9000BTU and 12000 BTU split air conditioner.
All copper line set 1/4 + 1/2 commonly used for 12000 BTU and 18000 BTU mini split air conditioners.
1/4 + 5/8 Insulated copper line set used for 24000 BTU and 30000 BTU air conditioner system.
3/8 + 5/8 Mini-split line set apply for 36000 BTU and 48000 ductless air conditioner.
3/8 + 3/4 Refrigerant line set used for 54000 BTU and 72000 split air conditioner installation.
3/8 + 7/8 Insulated copper pipe apply for 72000 BTU - 96000 BTU ductless mini split air conditioner.
Aircon copper line set 1/4 + 3/8 used for 9K and 12K split air conditioner.
High quality copper line set 1/4 + 1/2 commonly used for 12K and 18K mini split air conditioners.
1/4 + 5/8 Insulated copper line set used for 24K and 30K air conditioner system.
3/8 + 5/8 Mini-split line set apply for 36K and 48K ductless air conditioner.
3/8 + 3/4 Refrigerant line set used for 54K and 72K split air conditioner installation.
3/8 + 7/8 Insulated copper piping apply for 72K - 96K ductless mini split air conditioner.
Why Choose This Mini Split Line Set
Ready-to-Install Pre-Insulated Design
The line set arrives factory-insulated and ready for installation, reducing onsite labor time and complexity.
Durable and Weather-Resistant
UV-resistant insulation and pure copper tubing resist corrosion, outdoor exposure, and environmental wear, prolonging service life.
Optimized for Energy Efficiency
Insulation minimizes heat gain and condensation, helping HVAC systems run more efficiently and reducing energy costs.
DABUND FACTORY
We produce Insulated Copper Pipe, Mini Split Line Set and Aluminum Pipe and HVAC Parts
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SGS Certificate
Mini Split Line Set is made of Polypropylene or Black Rubber with UV Resistant, meets ASTM E 84, UL94, ASTM D1056 and ASTM G 21
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Exhibition
We join the exhibitions all over the word, just to facilitate customers to experience our mini split line set face to face.
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FAQ
What Is a Mini Split Refrigerant Line Set?
A Mini Split Refrigerant Line Set is a pair of copper tubes (liquid line and suction line) used to connect the indoor and outdoor units of a mini split air conditioning or heat pump system. It allows refrigerant to circulate efficiently between the two units for cooling and heating performance.
What Sizes Are Available for Mini Split Line Sets?
Mini split refrigerant line sets are available in common size combinations such as 1/4" x 3/8", 1/4" x 1/2", 3/8" x 5/8", and 1/2" x 3/4". The correct size depends on the BTU capacity and manufacturer requirements of your mini split system.
Are Mini Split Refrigerant Line Sets Pre-Insulated?
Yes, most mini split refrigerant line sets are pre-insulated with closed-cell foam insulation. This insulation helps reduce energy loss, prevent condensation, and protect the copper tubing from environmental damage in both indoor and outdoor installations.
What Type of Copper Is Used in Refrigerant Line Sets?
High-quality mini split line sets are made from 99.9% pure copper that meets ASTM B280 and EN 12735 standards. This ensures excellent pressure resistance, corrosion resistance, and long-term durability for HVAC and refrigeration applications.
Are These Line Sets Compatible with All Mini Split Brands?
Mini split refrigerant line sets are universally compatible with most major brands such as Mitsubishi, Daikin, LG, Fujitsu, Gree, Samsung, and more, as long as the line size and length match the system specifications.
What Lengths Do Mini Split Refrigerant Line Sets Come In?
Refrigerant line sets are available in multiple lengths including 10 ft, 15 ft, 25 ft, 50 ft, 75 ft, and 100 ft. Longer lengths are ideal for complex installations where indoor and outdoor units are installed farther apart.
Can Mini Split Line Sets Be Cut or Extended?
Yes, copper refrigerant line sets can be cut to the required length or extended using proper copper fittings and brazing techniques. Professional installation is recommended to ensure leak-free connections and system efficiency.
Are Mini Split Refrigerant Line Sets Suitable for Outdoor Use?
Absolutely. Pre-insulated mini split line sets are designed for both indoor and outdoor use. The UV-resistant insulation protects the copper tubing from sunlight, moisture, and temperature changes, making them suitable for long-term outdoor exposure.
Do Refrigerant Line Sets Support R410A and R32 Refrigerants?
Yes, most modern mini split refrigerant line sets are rated for high-pressure refrigerants such as R410A and R32. Always confirm pressure ratings to ensure compatibility with your specific HVAC system.
Is a Mini Split Refrigerant Line Set Included in Installation Kits?
Some mini split installation kits include a refrigerant line set along with brackets, condenser pads, and accessories. However, line sets can also be purchased separately to match custom installation needs.
Why Is Proper Insulation Important for Refrigerant Line Sets?
Proper insulation prevents heat gain or loss during refrigerant flow, improves system efficiency, reduces condensation, and helps prevent water damage or mold growth around the piping.
Are Mini Split Line Sets Energy Efficient?
Yes, when properly sized and insulated, mini split refrigerant line sets help maintain optimal refrigerant temperatures, contributing to higher energy efficiency and better overall system performance.
