A high-quality 100 ft pre-insulated copper tube with 3/8″ liquid line and 7/8″ suction line, engineered for long-distance HVAC refrigerant connections in mini split air conditioners, ductless heat pumps, and other split system installations where extended line runs are required.
The Pre Insulated Copper Tube is twin already. So buy it now.
Product Overview – Long-Length Insulated Copper Refrigerant Tube
This pre-insulated copper tubing line set provides a continuous 100 ft run with factory-applied insulation — minimizing heat gain and loss while preventing surface condensation. Designed to improve HVAC efficiency and simplify installation, this line set reduces the need for field insulation and helps maintain stable refrigerant temperatures over long distances.
Standard HVAC Tube Sizes Explained
3/8″ (≈9.52 mm) Liquid Line — Transports high-pressure refrigerant from outdoor condenser to indoor evaporator.
7/8″ (≈22.23 mm) Suction Line — Returns low-pressure refrigerant vapor back to the compressor.
Ideal for larger or high-capacity HVAC systems where longer line sets are needed.
Factory-Applied Insulation Enhances Efficiency
Helps preserve consistent refrigerant temperatures
Reduces thermal gain/loss along the tube length
Minimizes condensation buildup (“sweating”)
Saves installation time with pre-applied insulation
Key Features & Benefits
Long-Distance Refrigerant Lines for HVAC Systems
At 100 ft, this copper tube set provides extended reach for installations that typical shorter line sets cannot accommodate — such as rooftop units, detached outdoor units, or large home setups.
Improved Energy Efficiency
The insulated design enhances temperature stability, supporting better cooling and heating performance while helping reduce energy waste.
Durable Copper Construction
Made from 99.9% pure copper, this line set delivers superior corrosion resistance and thermal conductivity for reliable, long-term HVAC operation.
HVAC Compatibility & Applications
Suitable for Mini Split & Heat Pump Systems
This pre-insulated copper tube set works well with:
Mini split air conditioners
Ductless heat pump systems
Residential HVAC setups
Light commercial cooling systems
Whether extending an existing line run or installing a new system, this line set provides dependable performance.
Works With Common HVAC Refrigerants
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 Length | 100 ft (≈30.48 m) |
| Liquid Line Diameter | 3/8″ (≈9.52 mm) |
| Suction Line Diameter | 7/8″ (≈22.23 mm) |
| Material | 99.9% Pure Copper |
| Insulation | Factory-applied thermal insulation |
| Applications | Mini split, ductless AC, heat pump systems |
| Compatible Refrigerants | R410A, R32, and similar |
Installation Tips for Best Performance
Plan the Line Path Before Install
Measure the distance between indoor and outdoor units to confirm the 100 ft run will provide a smooth, low-stress path with gentle bends and minimal sharp turns.
Protect Insulation at Penetrations
Use wall sleeves, grommets, or protective conduit where the line set passes through walls or structural elements to preserve insulation integrity.
Support Line Set With HVAC-Rated Mounts
Secure the line set every few feet with HVAC-rated clips or straps to prevent vibration, sagging, and insulation compression over time.
![White PE copper line set]( "Copper Line Set")
Pre Insulated Copper Tube
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 Pre insulated copper tube 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 Pre insulated copper tube 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 Pre insulated copper tube 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 100 ft 3/8" x 7/8" Pre Insulated Copper Tube from DABUND PIPE
Engineered for Extended HVAC Line Runs
With a generous 100 ft length, this line set meets the needs of installations where indoor and outdoor units are far apart — eliminating the need for multiple short segments.
Consistent Thermal Performance
Factory insulation ensures consistent thermal protection and eliminates the need for field insulation, saving both labor and material costs.
Strong and Durable Build
Constructed with high-purity copper and factory insulation, this line set resists corrosion, thermal stress, and environmental wear — delivering reliable performance over time.
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.What does “3/8″ × 7/8″” mean?
It refers to the outer diameters of the refrigerant tubing: 3/8″ liquid line for refrigerant feed and 7/8″ suction line for refrigerant return, commonly used in larger HVAC systems and mini splits requiring higher suction volume.
8.Is this tube set insulated?
Yes — the tubing comes with factory-applied insulation that helps preserve refrigerant temperatures and reduces condensation issues without additional field wrapping.
9.Can this be used outdoors?
Yes — the insulation jacket is designed to be weather-resistant and UV-durable, making this line set suitable for outdoor installations between indoor and outdoor units.
10.Is this compatible with R410A refrigerants?
Yes — this line set supports common refrigerants like R410A and R32 when installed according to manufacturer and local building codes.
