Premium 50 ft HVAC line set with 1/4″ liquid (LL) and 3/8″ suction (SL) copper tubing — designed for efficient refrigerant transfer in mini split air conditioners, ductless HVAC systems, and general split system installations with extended line lengths.
The Mini Split Air Conditioner Line Set is twin already. So buy it now.
Product Overview – High-Quality HVAC Copper Line Set
The 1/4 LL × 3/8 SL × 50 ft HVAC line set combines factory-insulated copper tubing and standard plumbing features crafted for reliable and energy-efficient refrigerant flow. Ideal for connecting indoor evaporator coils to outdoor condenser units, this pre-insulated line set supports professional HVAC installations as well as experienced DIY projects.
Standard Refrigerant Line Sizes Explained
1/4″ LL (Liquid Line) — Carries liquid refrigerant from condenser to evaporator.
3/8″ SL (Suction Line) — Returns refrigerant vapor back to the compressor.
These sizes are common in mini split systems and many conventional split AC systems, offering balanced pressure and refrigerant flow characteristics.
50 ft Length for Flexible HVAC Installations
Supports longer distances between indoor and outdoor units
Allows cleaner line routing with fewer couplings than smaller kits
Ideal for multi-story homes, large living spaces, attic installs, and garages
Factory-Applied Insulation – Thermal Protection & Performance
Excellent Thermal Efficiency
Factory insulation helps preserve refrigerant temperature along the entire run, reducing heat gain and loss that can compromise cooling and heating performance.
Condensation Prevention & Moisture Control
Pre-insulated tubing minimizes surface condensation (sweating), protecting walls, framing, and other structural surfaces from moisture damage and stains — important in humid environments.
UV-Resistant and Weather-Durable Jacket
The insulation jacket is designed to be UV-resistant and withstand exposure in outdoor HVAC runs. This ensures line set performance in varied climates and installation conditions.
Premium Copper Construction for HVAC Reliability
99.9% Pure Copper Tubing
Constructed from high-purity copper that meets ASTM B280 and C12200 standards, this line set delivers excellent thermal conductivity, corrosion resistance, and mechanical durability for long-term HVAC use.
High Pressure Rating for Safe Operation
Built for system pressures well above typical HVAC scalars (often rated up to ~7000 PSI vs ~700 – 800 PSI working pressure for R410A systems), this line set offers extra reliability and safety for refrigerant transport.
HVAC Compatibility & Applications
Works with Mini Split & Ductless AC Systems
This 50 ft line set is ideal for:
Mini split air conditioners
Ductless heat pump systems
Residential split HVAC installs
Replacements or retrofits where existing refrigerant lines are worn or undersized
Compatible with Standard Refrigerants
Designed to work with commonly used HVAC refrigerants such as R410A, R32, and other compatible variants when installed per system manufacturer requirements.
Features of pipe insulation tubing:
![White PE Embossed insulated pipe]( "insulated pipe")
Key Benefits of This HVAC Line Set
Saves Time with Pre-Insulated Ready-to-Install Line
Factory-insulated lines eliminate the need for separate insulation wrap in most applications, saving installation time and ensuring consistent thermal protection quality.
Reduces Thermal Loss & Improves System Efficiency
With stable refrigerant temperatures along the line set, your HVAC system can operate closer to peak performance, reducing energy loss and improving comfort.
Minimal Condensation & Cleaner Installations
Insulated lines reduce condensation dripping that can stain ceilings, walls, and infrastructure, keeping installations cleaner and more professional.
Technical Specifications
| Feature | Detail |
| Line Set Length | 50 ft (~15.24 m) |
| Liquid Line (LL) Diameter | 1/4″ (6.35 mm) |
| Suction Line (SL) Diameter | 3/8″ (9.52 mm) |
| Material | 99.9% Pure Copper |
| Insulation | Factory-applied thermal insulation |
| Compatible Refrigerants | R410A, R32, and similar HVAC refrigerants |
| Pressure Rating | High-pressure rated (exceeds HVAC norms) |
| Applications | Mini split, ductless AC, split systems |
Installation Tips for Best Results
Measure the Line Path Before Starting
Confirm the total distance between indoor and outdoor units to ensure the 50 ft line set affords a clean route with gradual bends and minimal stress points.
Protect Insulation at Wall Penetrations
Use wall sleeves or protective grommets at any wall or structural penetration to prevent insulation abrasion and preserve thermal integrity.
Secure Tubing With Professional Supports
Install clips, straps, or HVAC brackets every few feet to reduce sagging, vibration, and long-term movement — maintaining alignment and insulation performance.
![White PE copper line set]( "Copper Line Set")
HVAC 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 HVAC 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 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.
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 piping apply for 72K - 96K ductless mini split air conditioner.
Why Choose This 50 ft HVAC Line Set
Reliable Materials & Professional-Grade Build
With 99.9% pure copper and quality insulation, this line set is built for long life, efficient performance, and fewer HVAC service callbacks.
Ready-to-Install & Time-Saving
Being factory insulated and pre-sized, the line set arrives ready for quick installation — saving time for professional HVAC techs and advanced DIYers alike.
Ideal for Residential & Light Commercial Projects
Perfect for standard homes, apartments, offices, or light commercial HVAC applications where line runs up to 50 ft are required.
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 “1/4 LL × 3/8 SL” mean?
This refers to the outer diameters of the two copper refrigerant tubes: 1/4″ for the liquid line (“LL”) and 3/8″ for the suction line (“SL”), a standard pairing used in many mini split and split HVAC systems.
8.Do I need to add more insulation on site?
No — this product comes with factory-applied insulation designed to meet thermal performance needs in most HVAC line runs without extra field insulation.
9.Is this suitable for outdoor HVAC line runs?
Yes — the insulation jacket is UV-resistant and weather-durable, making it suitable for exterior refrigerant pipe exposure between indoor and outdoor units.
10.Is this compatible with R410A mini split systems?
Yes — this HVAC line set supports commonly used refrigerants like R410A and R32, provided it’s installed per manufacturer and local code requirements.
