A reliable 1/4″ × 1/2″ mini split refrigerant line set, engineered for HVAC installations requiring pre-insulated copper tubing for efficient refrigerant transfer. Ideal for mini split air conditioners, ductless heat pumps, and many split system applications where durability, energy efficiency, and easy installation matter most.
The Mini Split Refrigerant Line Set is twin already. So buy it now.
Product Overview – Premium HVAC Refrigerant Line Set
The 1/4″ × 1/2″ mini split refrigerant line set includes two copper tubes with factory-applied insulation designed to help maintain stable refrigerant temperatures over the line run. This line set is optimized for connecting indoor evaporator units to outdoor condenser units, providing long-term performance without the need for field-wrapped insulation.
Line Size Explained – 1/4″ Liquid & 1/2″ Suction Lines
1/4″ (6.35 mm) liquid line carries the high-pressure liquid refrigerant from the outdoor unit to the indoor evaporator.
1/2″ (12.70 mm) suction line returns the low-pressure refrigerant vapor back to the compressor.
This size pairing is highly compatible with many mid-capacity mini split and ductless AC systems.
Factory-Applied Insulation for Efficiency
Pre-insulated copper tubing improves energy efficiency by reducing heat gain/loss.
Minimizes surface condensation (“sweating”) that can damage surrounding building materials.
Saves labor time by eliminating the need for field insulation wrapping.
Key Features & Benefits
Enhances HVAC System Performance
Factory-insulated lines help your HVAC system maintain consistent refrigerant temperatures, which supports smooth cooling and heating cycles while lowering the strain on compressors and reducing energy waste.
Durable & Corrosion-Resistant Construction
Made from 99.9% pure copper, this line set offers excellent corrosion resistance, thermal conductivity, and mechanical strength — delivering reliable long-term performance in a wide range of environments.
Reduces Condensation Buildup
Pre-insulated copper lines significantly reduce surface condensation — a common issue in humid climates — minimizing moisture damage and mildew formation around line runs.
HVAC Compatibility & Applications
Ideal for Mini Split & Ductless HVAC Systems
This refrigerant line set is perfect for:
Mini split air conditioners
Ductless heat pump systems
Residential split AC installations
Light commercial HVAC projects
Whether you’re installing a new system or servicing an existing one, this line set supports professional-grade results.
Compatible with Standard HVAC Refrigerants
Designed to be compatible with widely used refrigerants such as:
Features of pipe insulation tubing:
![White PE Embossed insulated pipe]( "insulated pipe")
Technical Specifications
| Feature | Specification |
| Line Set Type | Mini split refrigerant line set |
| Length | Standard length (check product variant) |
| Liquid Line Diameter | 1/4″ (≈6.35 mm) |
| Suction Line Diameter | 1/2″ (≈12.70 mm) |
| Material | 99.9% Pure Copper |
| Insulation | Factory-applied thermal insulation |
| Applications | Mini split / ductless AC / heat pump |
| Compatible Refrigerants | R410A, R32, and similar |
| Installation | Pre-insulated, ready for HVAC connection |
(If length variants exist, you can add additional rows for 15 ft, 25 ft, 50 ft, etc.)
Installation Tips for Best Performance
Measure Before You Install
Before beginning installation, confirm the total distance between indoor and outdoor units to ensure a proper fit without sharp bends that could restrict refrigerant flow.
Protect the Insulation at Penetrations
Use wall sleeves or protective grommets where the line set passes through walls to prevent insulation damage and maintain thermal performance over the long haul.
Secure Line Set With HVAC-Rated Supports
Install brackets or straps along the run to support the tubes and minimize vibration — this helps prevent sagging and preserves insulation integrity through continuous HVAC operation.
![White PE copper line set]( "Copper Line Set")
Mini Split Refrigerant 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 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 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 pipe apply for 72K - 96K ductless mini split air conditioner.
Why Choose Mini Split Refrigerant Line Set from DABUND PIPE
Reliable HVAC Performance You Can Count On
With pre-insulated copper tubing, this line set delivers efficient refrigerant transfer that supports consistent cooling and heating performance across system cycles.
Easy Installation Saves Time
Factory insulation and pre-flared ends reduce on-site labor and eliminate the need for additional insulation wrapping — making installation faster, cleaner, and more professional.
Ideal for Multiple HVAC Scenarios
Whether you’re a contractor handling residential installs or a DIYer working on a light commercial project, this line set offers compatibility and reliability for a variety of systems.
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.Reliable HVAC Performance You Can Count On
With pre-insulated copper tubing, this line set delivers efficient refrigerant transfer that supports consistent cooling and heating performance across system cycles.
8.Easy Installation Saves Time
Factory insulation and pre-flared ends reduce on-site labor and eliminate the need for additional insulation wrapping — making installation faster, cleaner, and more professional.
9.Ideal for Multiple HVAC Scenarios
Whether you’re a contractor handling residential installs or a DIYer working on a light commercial project, this line set offers compatibility and reliability for a variety of systems.
