Premium 50 ft pre-insulated copper line set with standard 3/8″ liquid and 5/8″ suction refrigerant tubing — ideal for efficient, durable installations of mini split air conditioners, ductless heat pumps, and HVAC systems.
Product Overview – Mini Split Line Set with Factory Insulation
The 50 ft 3/8″ × 5/8″ line set for mini split combines high-quality 99.9% pure copper tubing with factory-applied insulation for strong thermal efficiency and condensation control. This line set supports long runs between indoor and outdoor HVAC units and is ready-to-install for professional and DIY applications.
Standard Refrigerant Line Configuration for HVAC
3/8″ liquid line for refrigerant feed
5/8″ suction line for vapor return
Common configuration for many mid-range mini split and ductless systems (e.g., ~36 K–48 K BTU capacities) according to typical HVAC sizing guides.
50 ft Length for Flexible Installation Runs
Ideal for installations with moderate spacing between indoor and outdoor units
Eliminates need for multiple couplings or extensions
Supports clean routing through walls, ceilings, or utility spaces.
Factory-Applied Insulation – Thermal Protection & Moisture Control
Enhanced Thermal Efficiency
The insulation helps maintain stable refrigerant temperatures across the line set, reducing heat gain/loss that can lower HVAC efficiency and performance.
Condensation & Moisture Prevention
Pre-insulated lines reduce surface condensation, helping protect walls and structural surfaces from water damage, mold, and corrosion — especially in humid conditions.
UV-Resistant Insulation for Outdoor Exposure
The insulation jacket is UV-resistant and has passed standards such as ASTM E84, UL94, ASTM D1056 and ASTM G21, making it suitable for outdoor refrigerant runs.
Premium Copper Construction for HVAC Reliability
99.9% Pure Copper Refrigerant Lines
High Pressure Rating for HVAC Safety
Rated for 2100 to 7000 PSI — significantly above the typical ~700 PSI requirement for common refrigerants like R410A — ensuring durability and safety under normal HVAC pressures.
HVAC Compatibility & Typical Applications
Designed for Mini Split & Ductless Systems
This line set is ideal for connecting indoor evaporator coils to outdoor condenser units in:
Compatible with Common Refrigerants
Works with widely used refrigerants such as R410A, R32, and other industry standard HVAC refrigerants when installed per manufacturer specifications.
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 Mini Split Line Set
Simplifies Installation & Reduces Labor Costs
Pre-insulated and ready to install, this line set eliminates the need for onsite insulation wrapping and reduces installation time, especially for professional HVAC technicians and experienced DIYers.
Improves HVAC Efficiency & Performance
Stable refrigerant temperatures along the line set help maintain efficient cooling and heating cycles, reducing potential energy waste and system strain.
Durable & Corrosion-Resistant Construction
With high-quality copper and robust insulation, this line set resists corrosion, environmental wear, and moisture buildup for long-lasting performance.
Technical Specifications
| Feature | Specification |
| Line Set Length | 50 ft (≈15.24 m) |
| Liquid Line Size | 3/8″ (≈9.52 mm) |
| Suction Line Size | 5/8″ (≈15.88 mm) |
| Material | 99.9% Pure Copper |
| Insulation | Factory-applied, UV-resistant |
| Pressure Rating | 2100–7000 PSI |
| Applications | Mini split, ductless AC, heat pump, HVAC |
| Refrigerant Compatibility | R410A, R32, and similar HVAC refrigerants |
Installation Tips for Best Results
Plan Line Routing Before Installation
Measure and plan the route between indoor and outdoor units to ensure the 50 ft set covers the distance without sharp bends or tension points.
Protect Insulation at Penetration Points
Use wall sleeves or protective grommets where the line set passes through walls to avoid insulation damage and maintain thermal integrity.
Use Proper Supports for Long Runs
Install line clamps or HVAC-rated brackets along the run to secure tubing, reduce vibration, and prevent sagging or insulation compression over time.
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Mini Split 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 AC 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 Line set for mini split 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 Mini split 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 Mini split line set 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 This 50 ft Mini Split Line Set
Reliable Performance & Thermal Efficiency
With high-quality copper tubing and factory insulation, this line set delivers dependable performance, reduced energy loss, and long-lasting durability.
Ready-to-Install HVAC Solution
Perfect for HVAC professionals and experienced installers, this line set simplifies installation, reduces errors, and saves time on each job.
Versatile HVAC Compatibility
Suitable for a wide range of mini split, ductless, and heat pump systems, this line set supports confident performance across residential and light commercial 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
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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
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 outer diameters of the line set: 3/8″ for the liquid line and 5/8″ for the suction line, a standard configuration used in many mini split HVAC systems.
8.Is this line set suitable for outdoor HVAC runs?
Yes — the factory-applied insulation is UV-resistant and weather-durable, making this line set suitable for outdoor use between indoor and outdoor units.
9.Do I need extra insulation on site?
No — this product comes with factory insulation that meets typical HVAC insulation requirements, eliminating the need for extra field insulation in most installations.
10.Is this line set compatible with R410A systems?
Yes — this line set supports common modern refrigerants such as R410A and R32, making it suitable for most mini split and ductless HVAC systems.
