The 1/4" x 3/8" x 50 ft insulated copper pipe is a high-quality refrigerant line set designed for split air conditioners, ductless mini split systems, and HVAC refrigeration installations.

This insulated copper tubing connects the indoor evaporator and outdoor condenser units, allowing refrigerant to circulate efficiently and maintain stable cooling performance.

Manufactured with 99.9% pure copper, the pipe offers excellent heat transfer, corrosion resistance, and long-term durability. The tubing complies with ASTM B280 and C12200 standards, ensuring reliable performance for modern refrigerants such as R410A and R32.

The 50 ft line set length makes it ideal for residential and light commercial HVAC installations where extended refrigerant piping is required.

Product Specifications of the 1/4" x 3/8" Insulated Copper Line Set

This HVAC copper line set is manufactured according to international refrigeration system standards.

Technical Specifications

• Pipe Size: 1/4 inch + 3/8 inch (6.35 mm + 9.52 mm)

• Length: 50 ft (15.24 m)

• Copper Purity: 99.9% pure copper

• Copper Standard: ASTM B280 / C12200

• Insulation Material: Polyethylene foam or rubber insulation

• Working Temperature: -40°C to 120°C

• Pressure Rating: 2100 – 7000 PSI

• Compatible Refrigerants: R410A, R32

These specifications ensure reliable refrigerant flow and long-term HVAC system efficiency.

High-Purity Copper Tubing for Reliable Refrigerant Flow

Copper tubing remains the preferred material for HVAC refrigerant piping systems due to its superior thermal conductivity and durability.

Advantages of copper HVAC pipes include:

• Efficient heat transfer for improved system performance

• Excellent corrosion resistance

• High pressure tolerance for modern refrigerants

• Long service life compared with alternative materials

Because of these benefits, copper tubing is widely used in mini split air conditioners, heat pump systems, and commercial refrigeration equipment.

Factory-Applied Insulation for Energy Efficiency

The insulated copper pipe features high-density closed-cell insulation, which helps maintain the correct refrigerant temperature during system operation.

Benefits of factory insulation include:

• Reduces heat loss and heat gain

• Improves overall HVAC system efficiency

• Prevents condensation on pipe surfaces

• Eliminates the need for additional field insulation

This pre-insulated design also simplifies installation for HVAC technicians.

99.9% Pure Copper

Black Rubber Insulated Pipe

Plastic Cap

Features of pipe insulation tubing:

● Pipe Insulation, Material Black Rubber, Temp Range -40 Degrees to 120 Degrees.

● The pipe insulation has a better function of moisture condensation. Insulation material is both the insulation layer and moisture-proof layer.

● There is no need to drop the water vapor permeation protective layer so that it has a better moisture condensation function.

UV-Resistant Insulation for Indoor and Outdoor Installation

The insulation layer is manufactured with UV-resistant materials, allowing the copper pipe to withstand outdoor conditions such as sunlight, moisture, and temperature changes.

Key insulation features include:

• UV and weather resistance

• Moisture protection

• Flame retardant properties

• Durable structure for long-term use

The insulation materials meet safety standards including ASTM E84, UL94, ASTM D1056, and ASTM G21.

Wide HVAC Applications for Split AC and Refrigeration Systems

The 1/4" x 3/8" insulated copper pipe is widely used in various HVAC and refrigeration systems, including:

• Mini split air conditioning systems

• Ductless heat pumps

• Residential HVAC installations

• Light commercial cooling systems

• Refrigeration equipment

Its flexible copper coil design makes it easy to route through walls, ceilings, and building structures.

High Pressure Rating for Modern Refrigerants

This insulated copper line set is engineered to withstand high refrigerant pressures, with a pressure rating between 2100 PSI and 7000 PSI, which is significantly higher than the typical 700 PSI requirement for R410A systems.

This ensures safe operation and reliable refrigerant circulation in modern high-efficiency HVAC equipment.

Flexible Copper Coil for Easy HVAC Installation

The copper tubing is supplied in a coiled format, allowing HVAC installers to easily bend and route the pipe during installation.

Installation advantages include:

• Easy routing around obstacles

• Reduced number of joints and connections

• Faster installation time

• Lower risk of refrigerant leaks

This flexibility makes the copper line set ideal for both professional HVAC contractors and installation technicians.

Custom HVAC Copper Line Sets Available

Professional HVAC manufacturers can provide customization options to meet different installation requirements.

Customization services may include:

• Custom copper pipe sizes

• Different insulation thickness options

• Custom pipe lengths

• OEM logo printing on insulation

• Private label packaging

These options help HVAC distributors and contractors build their own branded product lines.

Insulated Copper Pipe for Split AC

1/4 + 3/8 Insulated copper pipe used for 0.75TON - 1.0TON mini split air conditioner.

1/4 + 1/2 Insulated copper line set used for 1.5TON - 2.0TON mini split air conditioning.

1/4 + 5/8 Insulated copper pipe 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.

Insulated copper pipe 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 pipe 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 Insulated copper pipe used for 54000 BTU and 72000 split air conditioner installation.

3/8 + 7/8 Insulated copper pipe 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 Insulated copper pipe 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.

DABUND is a professional manufacturer specializing in HVAC copper line sets, insulated copper pipes, and air conditioning installation accessories.

With advanced production equipment and strict quality control, the company supplies HVAC components to global distributors and contractors.

Key advantages include:

• More than 14 years of manufacturing experience

• Large-scale production capacity

• Strict quality inspection system

• Competitive factory pricing

DABUND products are widely used in global HVAC and refrigeration markets.

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.What is a 1/4" x 3/8" insulated copper pipe used for?

A 1/4" x 3/8" insulated copper pipe is commonly used as a refrigerant line set for mini split air conditioners, split AC systems, and HVAC refrigeration equipment. The copper tubing connects the indoor evaporator unit to the outdoor condenser unit, allowing refrigerant to circulate efficiently. The insulation layer helps maintain refrigerant temperature and prevents energy loss during operation.

2.What size mini split air conditioner uses a 1/4" x 3/8" copper line set?

A 1/4 inch liquid line and 3/8 inch suction line is typically used for 9,000 BTU to 12,000 BTU mini split air conditioning systems. However, the exact pipe size may vary depending on the air conditioner brand and system specifications, so installers should always follow the manufacturer’s recommendations.

3.Why is copper the preferred material for HVAC refrigerant pipes?

Copper is widely used in HVAC refrigeration systems because it offers excellent thermal conductivity, durability, and corrosion resistance. Copper tubing can handle high refrigerant pressures and provides efficient heat transfer, which helps air conditioning systems operate more efficiently and reliably.

4.Can a 50 ft insulated copper line set be shortened during installation?

Yes. A 50 ft insulated copper pipe can be cut to the required length during HVAC installation. Professional installers often trim the pipe according to the distance between the indoor and outdoor units. Reducing excess tubing can help improve installation efficiency and minimize the risk of refrigerant leaks.

5. What type of insulation is used on insulated copper pipes?

Most HVAC insulated copper pipes use closed-cell polyethylene (PE) foam or rubber insulation. This insulation provides excellent thermal protection, prevents condensation on the pipe surface, and protects the copper tubing from UV exposure and moisture. High-quality insulation also improves the overall energy efficiency of the HVAC system.

6.How long does an insulated copper HVAC line set last?

A high-quality insulated copper line set can last 20 years or more when installed correctly and maintained properly. Copper pipes are highly durable and resistant to corrosion, while the insulation layer protects the pipe from environmental damage and temperature fluctuations.

7.Are insulated copper pipes compatible with modern refrigerants?

Yes. Copper tubing manufactured according to ASTM B280 standards is compatible with modern refrigerants such as R410A, R32, and other high-pressure refrigerants used in today’s HVAC systems. These copper pipes are designed to handle the pressure and temperature requirements of modern air conditioning equipment.

8.Can insulated copper pipes be used for both residential and commercial HVAC systems?

Yes. Insulated copper pipes are widely used in both residential and commercial HVAC installations. They are suitable for mini split air conditioners, heat pumps, refrigeration equipment, and central air conditioning systems. Their durability and efficient heat transfer make them ideal for a wide range of cooling applications.

9.What insulation thickness is recommended for HVAC copper pipes?

The recommended insulation thickness depends on the installation environment and climate conditions. Common options include 8 mm, 10 mm, 13 mm, 19 mm, and 25 mm insulation thickness. Thicker insulation is typically recommended for outdoor installations or high-temperature environments to reduce heat loss and improve system efficiency.

10.Why choose a professional insulated copper pipe manufacturer?

Choosing a professional HVAC copper pipe manufacturer ensures consistent product quality, high-purity copper materials, and reliable insulation performance. Experienced manufacturers also provide OEM customization, strict quality control, and international certifications, making them trusted suppliers for HVAC distributors and contractors worldwide.