1/4″ x 3/8″ Mini Split Refrigerant Line Set – Insulated HVAC Copper Line

Premium 1/4″ x 3/8″ mini split refrigerant line set with factory-applied insulation, engineered for reliable refrigerant transfer in ductless air conditioners, heat pumps, and HVAC systems.

The Mini Split Air Conditioner Line Set is twin already. So buy it now.

Product Overview – High-Quality Refrigerant Line Set for HVAC Systems

This 1/4″ x 3/8″ mini split line set includes two copper tubes with pre-installed insulation, designed to connect indoor evaporator and outdoor condenser units. With superior thermal performance and durability, it helps ensure consistent operation and reduced energy loss in HVAC systems.

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Standard Size for Mini Split and Ductless AC HVAC Units

• 1/4″ liquid line and 3/8″ suction line

• Commonly used in many mini split air conditioners and ductless HVAC systems

• Compatible with a wide range of residential and light commercial units

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Factory-Applied Insulation for Enhanced Efficiency

• Insulation helps minimize heat gain and loss

• Prevents condensation and surface moisture buildup

• Saves installation time versus field insulation wrapping

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UV-Resistant Insulation for Indoor and Outdoor Use

The factory-applied insulation is UV-resistant and weather-durable, suitable for both indoor line passages and outdoor exposure, giving long-lasting protection for your HVAC line set.

Key Features & Benefits

High-Quality 99.9% Copper Tubing

Constructed with 99.9% pure copper tubing, this refrigerant line set delivers excellent thermal transfer, corrosion resistance, and mechanical strength for dependable HVAC performance.

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Energy-Efficient Line Set Design

The pre-insulated design improves overall system efficiency by reducing heat transfer and condensation, helping maintain optimal refrigerant temperature throughout the run.

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Easy to Install for Professionals and DIYers

With factory insulation and standard flare ends, this line set simplifies installation for HVAC professionals and experienced DIY users, reducing labor time and onsite work.

Features of pipe insulation tubing:

Compatibility & HVAC Applications

Works with Mini Split and Ductless AC Systems

This line set is compatible with most modern mini split and ductless air conditioning systems, making it suitable for residential homes, apartments, offices, and light commercial spaces.

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Supports Modern Refrigerants

Designed for use with common refrigerants such as R410A, R32, and other HVAC refrigerants, meeting required industry pressure ratings and safety standards.

Mini Split Refrigerant Line Set for HVACR Applications Wholesaler & Supplier

DABUND PIPE in-house tested insulate copper pipe and tubing is designed to make installation simple and quick – saving you time and money on each job.

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.

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.

Technical Specifications

• Line Size: 1/4″ (liquid) × 3/8″ (suction)

• Material: 99.9% pure copper tubing

• Insulation: Factory-applied UV-resistant insulation

• Application: Mini split, ductless AC, heat pump systems

• Length: (Length options per SKU as listed on product page)

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Installation Tips for Best Results

Plan Your Line Routing Before Installation

Measure the total run length and confirm routing path to avoid sharp bends or kinks that may impact refrigerant flow or insulation integrity.

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Use Proper Support and Fasteners

Secure refrigerant lines with appropriate clamps or straps to prevent vibration, sagging, and damage during HVAC operation.

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Check Manufacturer Line Length Limits

Verify that the total line length conforms to the mini split system manufacturer’s specifications for best performance and warranty compliance.

Why Choose This 1/4″ x 3/8″ Mini Split Line Set?

Reliable Performance and Ease of Installation

With high-quality copper tubing and factory insulation, this line set offers dependable HVAC performance, lower energy loss, simplified installation, and long-lasting durability.

DABUND FACTORY

We produce Insulated Copper Pipe, Mini Split Line Set and Aluminum Pipe and HVAC Parts

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

Exhibition

We join the exhibitions all over the word, just to facilitate customers to experience our mini split line set face to face.

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″ x 3/8″” mean in this refrigerant line set?

It refers to the outer diameters of the two copper tubes: 1/4″ for the liquid refrigerant line and 3/8″ for the suction line, a widely used configuration in mini split HVAC systems.

8.Is this line set compatible with all mini split brands?

Yes — the standard 1/4″ x 3/8″ size and quality construction make this line set compatible with most mini split and ductless AC units. Always check your system’s specifications before installation.

9.Do I need extra insulation in the field?

No — this line set comes with factory-applied insulation, eliminating the need for additional field wrapping in typical installations.

10.Is this line set suitable for outdoor installations?

Yes — UV-resistant insulation allows this line set to withstand outdoor exposure, protecting it against sunlight and weather effects.