The 50 ft 3/8″ × 5/8″ mini split long line set from DABUND offers a ready-to-install, pre-insulated copper refrigerant tubing solution designed for efficient, reliable performance in mini split air conditioners, ductless HVAC systems, and heat pumps where extended line runs are required.
The Mini Split Long Line Set is twin already. So buy it now.
Product Overview – High-Quality Long Line Set for HVAC Systems
This pre-insulated copper line set includes a 3/8″ liquid line and 5/8″ suction line with factory applied insulation to maintain refrigerant temperature, reduce thermal loss, and minimize condensation. With a length of 50 ft, this line set provides flexibility for longer installations where indoor and outdoor units require extended reach without sacrificing performance.
Standard Mini Split Line Configuration
3/8″ (≈9.52 mm) liquid line – carries condensed refrigerant from outdoor condenser to indoor evaporator
5/8″ (≈15.88 mm) suction line – returns low-pressure refrigerant vapor back to the compressor
Common size pairing for many split system and mini split installations
Pre-Insulated for Enhanced Efficiency
Factory-applied insulation ensures minimal thermal gain/loss
Helps prevent condensation (“sweating”) on the tubing surface
Eliminates the need for time-consuming field insulation work
Improves cooling/heating performance over longer line runs
Key Features & Benefits
Designed for Extended Line Runs
With a 50 ft length, this line set is ideal for installations where the indoor and outdoor units are separated by moderate distances — common in multi-story homes, offices, or rooftop setups.
Energy Efficiency Through Quality Insulation
Pre-insulated tubing reduces heat transfer that can otherwise reduce cooling efficiency. This helps your HVAC system maintain stable temperatures while minimizing unnecessary energy loss.
Durable Copper Construction
Made with 99.9% pure copper, this line set offers excellent corrosion resistance, optimal thermal conductivity, and robust mechanical strength — providing long-lasting HVAC reliability.
HVAC Compatibility & Applications
Suitable for Mini Split & Ductless Systems
This long line set works well with:
Mini split air conditioners
Ductless heat pump systems
Residential and light commercial HVAC applications
Whether replacing an old line set or installing a new system, this kit provides extended reach without additional splicing.
Works With Standard Refrigerants
Compatible with commonly used refrigerants such as:
Features of pipe insulation tubing:
![White PE Embossed insulated pipe]( "insulated pipe")
Technical Specifications
| Feature | Specification |
| Line Set Length | 50 ft (~15.24 m) |
| 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 |
| Compatible Refrigerants | R410A, R32, others |
| Installation | Pre-insulated and ready to install |
Benefits of Choosing This Long Line Set
Ready-to-Install HVAC Solution
Factory insulation and standardized fittings allow for quick and reliable installation, saving time and reducing on-site labor.
Reduced Condensation & Moisture Issues
Built-in insulation lowers the risk of condensation build-up, which helps prevent water damage, staining, or mildew around indoor units and wall penetrations.
Reliable Thermal & Mechanical Performance
Copper’s high thermal conductivity and corrosion resistance ensure consistent refrigerant flow while resisting rust and environmental wear over time.
Installation Tips for Optimal Performance
Measure Line Path Before Starting
Before installation, measure the total distance between indoor and outdoor units to confirm the 50 ft line set will offer an efficient routing path with gentle bends and minimal stress points.
Protect Insulation at Penetrations
Use wall sleeves or protective grommets where the line set passes through walls or structures — this helps preserve insulation integrity and prevents damage.
Secure Tubing with HVAC-Rated Supports
Use clamps, straps, or brackets every few feet to secure the line set, reduce vibration, and maintain insulation performance over time.
![White PE copper line set]( "Copper Line Set")
Mini Split 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 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 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 pipe 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 50 ft 3/8" x 5/8" Mini Split Long Line Set from DABUND PIPE
Trusted Quality & Extended Installation Flexibility
With high-purity copper tubing and reliable factory insulation, this line set delivers performance you can trust — even on longer installations where consistent refrigerant temperatures matter.
Saves Time and Cost with Factory Insulation
Pre-insulated lines reduce on-site work and eliminate the need for separate insulation materials and labor, helping installers save time and overall cost.
Ideal for Residential & Light Commercial HVAC Projects
Whether installing a new mini split system or upgrading an existing one, this line set offers flexibility, durability, and professional-grade performance for a wide range of 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]( "TRADE SHOW")
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 copper refrigerant lines: 3/8″ liquid line and 5/8″ suction line, a standard configuration used in many mini split and split system HVAC applications.
8.Is this line set insulated?
Yes — the copper tubing comes with factory-applied insulation that improves thermal efficiency, reduces condensation, and eliminates the need for extra field insulation.
9.Can this be used outdoors?
Yes — the insulation jacket is weather-resistant and UV-durable, making this long line set suitable for outdoor exposed runs between indoor and outdoor units.
10.Is this compatible with R410A refrigerants?
Yes — this line set supports common refrigerants such as R410A and R32 when installed according to manufacturer guidance and local HVAC codes.
