The 3/8″ × 5/8″ HVAC line set from DABUND is a professional-grade, pre-insulated copper refrigerant line engineered for reliable and efficient performance in mini split systems, ductless air conditioners, heat pumps, and other HVAC applications.
The Mini Split Air Conditioner Line Set is twin already. So buy it now.
Product Overview – High-Quality Refrigerant Line Solution
This pre-insulated HVAC line set features two premium copper tubes — a 3/8″ liquid line and a 5/8″ suction line — designed to deliver smooth refrigerant flow between indoor and outdoor units. With factory-applied insulation, this line set helps maintain refrigerant temperature, reduce condensation, and improve overall system efficiency.
Standard HVAC Refrigerant Line Size Explained
3/8″ (≈9.52 mm) Liquid Line: Carries high-pressure liquid refrigerant from the outdoor unit into the indoor evaporator.
5/8″ (≈15.88 mm) Suction Line: Returns low-pressure refrigerant vapor back to the compressor outdoors.
This size pairing is widely accepted for mid-capacity mini split and split system HVAC installations.
Factory-Applied Insulation for Reliability
The pre-insulated design delivers multiple advantages:
✔ Maintains consistent refrigerant temperature
✔ Reduces energy loss over longline runs
✔ Minimizes surface condensation (“sweating”)
✔ Eliminates need for field-wrapped insulation
Key Features & Benefits
Enhanced System Efficiency
Insulated copper tubing helps your HVAC system operate more efficiently by preserving refrigerant temperature and reducing thermal loss — which can translate into lower energy costs and stronger cooling capacity.
Durable Copper Construction
Made from 99.9% pure copper, this line set offers excellent corrosion resistance, thermal conductivity, and mechanical strength, delivering long-lasting performance in both residential and commercial HVAC environments.
Designed for Long-Term Reliability
High-quality materials and manufacturing precision ensure this line set stands up to repeated cooling and heating cycles without degradation, reducing maintenance needs and installation callbacks.
Features of pipe insulation tubing:
![White PE Embossed insulated pipe]( "insulated pipe")
HVAC Compatibility & Applications
Ideal for Mini Split & Ductless AC Systems
This line set is perfect for:
Mini split air conditioners
Ductless heat pumps
Residential HVAC installations
Light commercial cooling systems
Whether you’re replacing old lines or installing a new system, this set supports reliable refrigerant flow and performance.
Compatible with Popular HVAC Refrigerants
This line set supports widely used refrigerants such as:
Technical Specifications
| Feature | Specification |
| Line Set Type | HVAC Refrigerant Line Set |
| Liquid Line Diameter | 3/8″ (≈9.52 mm) |
| Suction Line Diameter | 5/8″ (≈15.88 mm) |
| Material | 99.9% Pure Copper |
| Insulation | Factory-applied thermal insulation |
| Applications | Mini split, ductless AC, heat pump systems |
| Refrigerants Supported | R410A, R32, and similar HVAC refrigerants |
| Installation | Pre-insulated, ready for connection |
Installation Tips for Best Results
Measure Line Path Before Installation
Before installation, measure the total distance between your indoor and outdoor units, and plan a routing path with gentle bends and no sharp corners to protect the refrigerant flow and insulation integrity.
Protect Insulation at Wall Penetrations
Use wall sleeves or protective grommets where the line set passes through walls to maintain insulation condition and prevent abrasion.
Secure Tubing With Professional Supports
Use HVAC-rated straps, clips, or brackets to support the line set along its run. Proper support helps prevent sagging, reduces vibration, and maintains insulation effectiveness over time.
![White PE copper line set]( "Copper Line Set")
HVAC 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 HVAC lineset used for 54000 BTU and 72000 split air conditioner installation.
3/8 + 7/8 Insulated copper piping 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 HVAC lineset used for 54K and 72K split air conditioner installation.
3/8 + 7/8 Insulated copper pipe apply for 72K - 96K ductless mini split air conditioner.
Why Choose HVAC Line Set from DABUND PIPE
Professional-Grade HVAC Component
Constructed from high-purity copper with quality insulation, this line set is designed for dependable performance, reduced energy loss, and long-lasting reliability.
Saves Time with Factory Insulation
Factory-insulated copper tubing reduces installation labor and ensures consistent thermal protection compared to field-wrapped alternatives.
Versatile for Multiple HVAC Installations
Whether for residential homes, offices, or light commercial properties, this line set offers flexibility and reliability for various split system applications.
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″ × 5/8″” mean?
It refers to the outside diameters of the two refrigerant lines: 3/8″ liquid line and 5/8″ suction line, a standard size pairing commonly used in mini split and ductless HVAC systems.
8.Is this refrigerant line insulated?
Yes — this line set includes factory-applied insulation that helps reduce thermal loss, improve efficiency, and eliminate the need for field insulation wrapping in most installations.
9.Can this be used outdoors?
Yes — the insulation jacket is UV-resistant and weather-durable, making this line set suitable for outdoor runs between indoor and outdoor HVAC components.
10.Is this compatible with R410A systems?
Yes — this line set supports common refrigerants like R410A and R32 when installed correctly and in accordance with HVAC manufacturer specifications and local building codes.
