Premium 3/8″ × 7/8″ refrigerant line set designed for HVAC applications including ductless mini split air conditioners, heat pumps, VRF systems, and centralized HVAC units. Made with 99.9% pure copper and factory-applied insulation for lasting performance and efficient refrigerant transport.
Product Overview – Durable Insulated HVAC Copper Line Set
This 3/8″ × 7/8″ refrigerant line set features high-quality copper tubing and protective insulation built for reliable HVAC operation. It connects indoor evaporator coils to outdoor condenser units, enabling smooth refrigerant circulation and efficient heat exchange across various systems.
Standard 3/8″ × 7/8″ Refrigerant Line Size
3/8″ liquid line for refrigerant feed
7/8″ suction line for refrigerant return
Commonly used on larger capacity mini splits and HVAC systems (~6–8 TON or ~72K–96K BTU class).
Versatile Length Options for Installation
Available in multiple lengths (1 m – 50 m), making the set adaptable for short or moderate indoor–outdoor runs. This flexibility allows installers to choose the right line set for each job without custom fabrication.
Factory-Applied Insulation – Thermal & Moisture Protection
High-Density Insulation for Thermal Efficiency
The insulation is made from 1/2″ polypropylene foam with a closed-cell structure that reduces heat gain or loss and helps maintain stable refrigerant temperatures throughout the line set.
UV-Resistant & Durable Jacket
Insulation meets safety and durability standards including ASTM E84, UL94, ASTM D1056, and ASTM G21, providing UV resistance and flame performance suitable for outdoor exposure.
Moisture & Condensation Control
The insulation acts as both thermal barrier and moisture proofing layer, minimizing surface condensation that can otherwise cause structural damage and mold issues.
Premium Copper Construction for HVAC Reliability
99.9% Pure Copper Tubing
Manufactured from high-purity copper that complies with ASTM B280 and C12200 standards, this line set delivers excellent thermal conductivity, corrosion resistance, and long-term durability in HVAC systems.
High Pressure Safety Rating
Rated between 2100 and 7000 PSI, significantly exceeding the ~700 PSI required for R410A refrigerant systems, ensuring safe and robust performance under normal operating conditions.
HVAC Compatibility & Applications
Ideal for Mini Split & Ductless HVAC Systems
This refrigerant line set is perfect for:
Its 3/8″ × 7/8″ configuration suits larger capacity units requiring a larger suction line.
Works With Modern Refrigerants
Compatible with common HVAC refrigerants including R410A and R32 when installed per manufacturer guidelines, ensuring broad applicability across modern systems.
Features of pipe insulation tubing:
● Pipe Insulation, Material Black Rubber, Temp Range -40 Degrees to 120 Degrees.
● The pipe insulation has a better function of moisture condensation. Insulation material is both the insulation layer and moisture-proof layer.
● There is no need to drop the water vapor permeation protective layer so that it has a better moisture condensation function.
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Key Benefits of This Refrigerant Line Set
Ready-to-Install, Pre-Insulated Design
Factory-applied insulation eliminates the need for additional field wrapping, saving installation time and labor costs while ensuring consistent thermal protection.
Improves HVAC Efficiency
Stable refrigerant temperatures and minimal thermal loss enhance cooling and heating cycle efficiency, potentially lowering energy use.
Corrosion-Resistant and Long-Lasting
Copper’s natural corrosion resistance combined with robust insulation materials supports long service life and reliable performance in varied environments.
Technical Specifications
| Feature | Detail |
| Line Size (Liquid/Suction) | 3/8″ × 7/8″ |
| Material | 99.9% Pure Copper |
| Insulation | Factory-Applied, UV-Resistant |
| Working Temperature | -40 °C to 120 °C |
| Pressure Rating | 2100–7000 PSI |
| Applications | Mini split, HVAC, heat pumps |
| Standards Met | ASTM B280, C12200, ASTM E84, UL94, ASTM D1056, ASTM G21 |
Installation Tips for Optimal Results
Plan the Line Path Before Installing
Measure total run distance and plan the routing to avoid unnecessary bends or stress points, ensuring smooth refrigerant flow and system efficiency.
Protect Insulation at Wall Pass-Throughs
Use sleeves or grommets where the line set passes through walls to protect the insulation from abrasion and maintain performance.
Secure Line Set With Proper Supports
Install HVAC-rated clamps or brackets along the run to reduce vibration, minimize sagging, and maintain insulation integrity.
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Mini Split Refrigerant Line Set
Size | Length | Insulation Black Rubber | 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 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.
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 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 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 3/8″ × 7/8″ Refrigerant Line Set
High-Quality Copper and Reliable Insulation
Manufactured with 99.9% pure copper tubing and robust insulation that meets multiple safety and performance standards, this line set offers long-term reliability for HVAC installations.
Installation-Ready HVAC Solution
Pre-insulated and available in multiple lengths, this refrigerant line set reduces preparation work on site, saving time for both professional technicians and experienced DIYers.
Suitable for Residential & Commercial HVAC Projects
Whether installing a large mini split system or connecting heat pump components, this line set provides flexibility and dependable performance across diverse HVAC 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.
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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″ × 7/8″” refer to?
It describes the outer diameters of the refrigerant tubing — 3/8″ liquid line and 7/8″ suction line — a configuration suitable for larger capacity HVAC and mini split systems requiring higher refrigerant return volume.
8.Is this line set suitable for outdoor use?
Yes — the insulation is UV-resistant and weather durable, designed for both indoor and outdoor HVAC refrigerant runs.
9.Do I need additional insulation in the field?
No — this product includes factory-applied insulation that typically meets most standard installation requirements without extra field wrapping.
10.Is this compatible with R410A mini split systems?
Yes — this line set supports common refrigerants like R410A and R32 when installed correctly according to system specifications.
