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

High-quality mini split refrigerant line set in 3/8″ x 3/4″ configuration, with UV-resistant insulation and 99.9% pure copper tubes — ideal for ductless mini split, heat pump, and HVAC applications.

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

Overview – Reliable Refrigerant Lines for HVAC and Mini Split Systems

This 3/8″ x 3/4″ mini split refrigerant line set consists of two semi-flexible copper tubes with factory-applied insulation, engineered to connect outdoor condensers and indoor evaporators in modern HVAC systems. It meets stringent quality standards and is suitable for residential and commercial installations.

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High-Purity 99.9% Copper Tubing for Superior Performance

The line set uses 99.9% pure copper tubes that comply with ASTM B280 and C12200 standards, ensuring excellent thermal conductivity, corrosion resistance, and reliable long-term performance.

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Universal Size 3/8″ x 3/4″ for Common Mini Split Units

The 3/8″ (liquid line) and 3/4″ (suction line) diameter is widely used in 4.5 TON – 6 TON mini split and traditional HVAC systems, making this line set a versatile choice for a wide range of applications.

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Factory-Applied Insulation — UV Resistant and Weather-Tough

Pre-insulated with UV-resistant polypropylene foam, this line set meets ASTM E84, UL94, ASTM D1056, and ASTM G21 standards. It offers reliable protection against weather, heat loss, condensation, and environmental wear, suitable for outdoor installation.

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Wide Compatibility with Refrigerant Types and HVAC Models

This pre-insulated copper line set works with all common refrigerants including R410A, R32, R22, and others used in mini split, heat pump, and central HVAC systems — ensuring flexibility for different system designs.

Features of pipe insulation tubing:

Key Features & Technical Highlights

Pressure & Durability Exceeds Industry Requirements

With pressure handling from 2100 to 7000 PSI — far above the standard 700 PSI requirement for R410A systems — this line set provides enhanced mechanical strength and system safety.

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Available Lengths and Customization Options

Standard lengths include 15 m, 20 m, 25 m, 30 m, and 50 m, with optional OEM branding and insulation markings tailored to your project needs.

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Easy Installation Saves Time and Labor

Pre-insulated design simplifies installation by eliminating the need for field insulation wrap — reducing installation time and minimizing onsite errors for HVAC technicians and installers.

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Technical Specifications

• Model: DBJ-003

• Brand: DABUND

• Material: 99.9% Pure Copper Tubing

• Insulation: UV-Resistant Polypropylene Foam

• Working Temp: -40℃ to 120℃

• Standards: ASTM B280, C12200, E84, UL94, ASTM D1056, ASTM G21

• Applications: Mini Split AC, Heat Pump, Central HVAC Systems

• Lengths: 15 m – 50 m (custom available)

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 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 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 piping apply for 72K - 96K ductless mini split air conditioner.

Why Choose This Mini Split Line Set?

Quality Manufacturing Since 2008

DABUND has extensive experience producing HVAC copper pipes and line sets, ensuring consistent quality, export-ready manufacturing, and reliable supply for global customers.

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Proven Performance in HVAC Installations

Designed for long-term durability and thermal efficiency, this line set improves system performance while reducing energy loss and installation effort.

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 3/8″ x 3/4″ mean in a mini split line set?

It refers to the outer diameters of the two copper tubes: 3/8″ for the liquid refrigerant line and 3/4″ for the suction line — a common sizing used in medium to large mini split systems.

8.Is this line set compatible with R410A refrigerant?

Yes — the copper and insulation are rated for high-pressure systems including R410A, R32, and other common refrigerants.

9.Do I need additional insulation in the field?

No — the line set comes factory-insulated with UV-resistant foam, eliminating the need for extra insulation wraps in most installations.

10.Can I order custom lengths or branding?

Yes — custom lengths and OEM branding options are available to match specific installation requirements and project specifications