High-quality 3/8″ × 3/4″ copper line set for HVAC systems, mini split air conditioners, heat pumps, and ductless cooling applications — engineered with 99.9% pure copper and factory-applied insulation for enhanced performance and reliability
The Mini Split Air Conditioner Line Set is twin already. So buy it now.
Product Overview – HVAC Copper Refrigerant Line Set
The 3/8″ × 3/4″ copper line set features twin copper tubes (liquid and suction lines) with durable insulation, designed to transport refrigerant between indoor and outdoor units in split system HVAC installations — from small residential mini splits to larger ducted systems.
Standard Line Size for Efficient Refrigerant Flow
3/8″ liquid line and 3/4″ suction line diameters, a common configuration for refrigerant systems
Optimized for balanced flow, pressure, and heat transfer
Compatible with many HVAC models requiring this size pairing
High-Purity 99.9% Copper Construction
Made from 99.9% pure copper tubing meeting ASTM B280 & C12200 standards
Excellent thermal conductivity for efficient heat exchange
Strong corrosion resistance for long service life in HVAC environments
Factory-Applied Insulation – Durable and Weather-Resistant
Pre-Insulated for Thermal Efficiency
Comes with factory-applied insulation that resists heat gain and minimizes energy loss
Designed to reduce condensation and improve system performance
UV-resistant and suitable for both indoor and outdoor applications
Certified Insulation Materials
Insulation materials meet ASTM E84, UL94, ASTM D1056, and ASTM G21 standards
Operates in a wide temperature range from –40 °C to 120 °C
Helps the line set maintain reliable performance in varied climates
Key Features & Benefits
Versatile Application for HVAC Systems
Compatible with mini split air conditioners, heat pumps, and centralized HVAC units
Works with common refrigerants including R410A, R32, and R22
Suitable for residential, commercial, and industrial HVAC installations
Higher Pressure Capacity Than Required
Pressure rating ranges from 2100 to 7000 PSI, significantly above typical HVAC needs
Designed for reliable performance even under heavy operational loads
Easy Installation for HVAC Professionals
Pre-insulated, ready-to-install tubing simplifies job site setup
Flexible yet durable copper tubing can be routed through walls and tight spaces
Reduced need for additional insulation or field modifications
HVAC Compatibility & Applications
Ideal for Mini Split & Ductless Systems
Designed to connect indoor evaporator coils with outdoor condensers in mini split and ductless HVAC systems of various capacities — offering reliability for both new installs and replacements.
Suitable for Central Ducted HVAC and Heat Pumps
Also compatible with larger ducted HVAC systems and heat pumps where the 3/8″ liquid line and 3/4″ suction line size is recommended, ensuring broad usability across different HVAC designs.
Features of pipe insulation tubing:
![White PE Embossed insulated pipe]( "insulated pipe")
Technical Specifications
| Feature | Specification |
| Line Size (OD) | 3/8″ (Liquid), 3/4″ (Suction) |
| Material | 99.9% Pure Copper |
| Insulation | Factory-Applied, UV-Resistant |
| Applicable HVAC Types | Mini split, ductless AC, heat pump, central HVAC |
| Refrigerant Compatibility | R410A, R32, R22, and other common refrigerants |
| Pressure Rating | 2100-7000 PSI |
| Standards | ASTM B280, C12200 |
Installation Tips for Best Results
Measure & Prepare the Line Path First
Plan the distance and routing between indoor and outdoor units, avoiding sharp bends or tight spots that could restrict refrigerant flow or damage insulation.
Protect Insulation at Penetration Points
Use wall sleeves or protective grommets where the line set passes through walls to maintain insulation integrity and avoid abrasion.
Secure the Line Set During Install
Use clips or HVAC line supports along the run to reduce vibration, ensure stability, and maintain insulation performance over time.
![White PE copper line set]( "Copper Line Set")
Copper 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 Copper 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 Copper 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 3/8″ × 3/4″ Copper Line Set
Trusted HVAC Quality & Durable Construction
Premium copper materials and certified insulation ensure consistent refrigerant flow, reduced heat loss, and long-lasting performance.
Professional-Grade Performance for Technicians
Built to meet stringent HVAC standards and pressure requirements, this line set provides dependable performance for technicians and contractors.
Wide Compatibility for Various HVAC Projects
Whether you’re installing a new mini split system or replacing an existing line set, this product offers flexibility and compatibility with a variety of HVAC models.
DABUND FACTORY
We produce Insulated Copper Pipe, Mini Split Line Set and Aluminum Pipe and HVAC Parts
![Factory Profile]( "Factory Profile")
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
![证书]( "证书")
Exhibition
We join the exhibitions all over the word, just to facilitate customers to experience our mini split line set face to face.
![TRADE SHOW PARTICIPATION]( "TRADE SHOW PARTICIPATION")
FAQ
1.Q:What is your payment terms?
A:TT,L/C AT SIGHT,CREDIT CARD etc
2.Q:What is your delivery terms?
A:EXW, FOB, CFR, CIF etc
3.Q:Are you trading company or manufacturer?
A:Manufacturer
4.Q:May I get a sample?
A:Yes, we can send you 3pieces free samples.
You just charge for the express cost is ok.
5.Q:Can I print my logo?
A:Yes of cause, we accept OEM and ODM.
6.Q:How long is your delivery time?
A:Usually 15-20days, if urgent, we can arrange to do in advance and delivery fast.
7.What does “3/8″ × 3/4″” mean?
It refers to the outer diameters of the refrigerant copper tubes: a 3/8″ liquid line and a 3/4″ suction line, a standard size configuration in mini split and HVAC systems.
8.Can this line set handle modern refrigerants?
Yes — this copper line set supports common refrigerants such as R410A, R32, and R22, making it suitable for many new and existing HVAC installations.
9.Do I need extra insulation in the field?
No — factory-applied insulation is designed to provide effective thermal protection, eliminating most needs for additional field insulation.
10.Is this copper line set suitable for outdoor use?
Yes — the insulation is UV-resistant and weather durable, capable of withstanding outdoor exposure when connecting condenser and evaporator units.
