Premium 50 ft 1/4″ × 3/8″ mini split long line set engineered for reliable HVAC installations. This pre-insulated copper refrigerant line set is ideal for mini split air conditioners, heat pumps, and ductless systems, offering superior durability and energy efficiency in residential and commercial applications.
The Mini Split Long Line Set is twin already. So buy it now.
Product Overview – 50 ft Mini Split Long Line Set
This 50 ft long line set provides a complete refrigerant piping solution with factory-applied insulation that simplifies installation and enhances overall system performance:
3/8″ × 1/4″ copper tubing configuration
Length: 50 ft (15.2 meters)
High-density insulation reduces heat loss and condensation
Pre-insulated lines ready for quick connection
Designed for extended installations between indoor and outdoor HVAC units, this line set reduces labor time and improves energy efficiency.
Technical Specifications – Built for HVAC Performance
Premium Copper Refrigerant Tubing
Material: 99.9% pure seamless copper
Sizes: 1/4″ liquid line & 3/8″ suction line
Excellent thermal conductivity supporting efficient refrigerant flow
Durable corrosion-resistant construction for long service life
Copper’s superior heat transfer properties promote improved cooling and heating performance in HVAC systems.
Factory-Applied Insulation
High-density insulation applied at the factory
UV and moisture-resistant outer jacket
Helps prevent condensation and energy loss
Contributes to consistent HVAC performance
Pre-insulated tubing saves installation time and provides reliable thermal protection across diverse climates.
Features of pipe insulation tubing:
![White PE Embossed insulated pipe]( "insulated pipe")
Key Benefits of This Mini Split Long Line Set
Ideal for HVAC & Mini Split Systems
This line set is engineered for ductless mini split units, heat pumps, and residential or light commercial HVAC systems — delivering dependable refrigerant flow and thermal efficiency.
Faster Installation & Reduced Labor
Pre-insulated and pre-flared ends help reduce on-site work time, lowering installation labor costs and simplifying connections.
Enhanced System Efficiency
Pre-insulation minimizes heat exchange with ambient air, improving your system’s cooling and heating performance while reducing energy consumption.
Applications – Where This Line Set Is Used
This 50 ft mini split long line set is suitable for:
Residential ductless AC installations
Wall-mounted and ceiling-mounted mini split systems
Heat pump refrigerant lines
Retrofit and replacement line set projects
Light commercial HVAC setups
Ideal for HVAC professionals, contractors, wholesalers, and experienced DIY installers.
HVAC Installation Best Practices
For optimal performance and system longevity, follow these expert installation tips:
Measure total run length before cutting the tubing.
Avoid kinks or sharp bends which restrict refrigerant flow.
Ensure continuous insulation coverage to prevent thermal loss.
Use proper flaring and sealing tools for leak-proof connections.
Adhering to these best practices helps maximize system efficiency and minimize maintenance issues.
![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 1/4" x 3/8" Mini Split Long Line Set from DABUND PIPE
We are manufacturer of mini split line set since 2008 years, have good experience of producing and exporting. We have cooperated 9 years forwarder, can guarantee the shipment. Every week we load at least 6-8 40HQ to different countries. Choose Dabund You will win the business.
Individual pre-insulated rolls to perfectly fit every ductless mini-splits, VRF, heat pumps and unitary systems installation.
Quality products with competitive pricing
Peace of mind with professional services
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.Is this long line set compatible with all mini split brands?
Yes — this 1/4″ × 3/8″ line set works with most ductless mini split and HVAC systems available in the US and global markets. Always confirm specifications with the manufacturer.
8.Can this line set be trimmed to fit custom installations?
Yes — the copper tubing can be cut to length as needed. Proper flaring and sealing after cutting are essential to maintain leak-proof integrity.
9.Is additional insulation required for outdoor installations?
The factory pre-insulation is suitable for most outdoor HVAC runs. In extreme weather or UV exposure situations, additional protective conduit is recommended.
