3/8" x 5/8" Mini Split Line Set – Insulated Copper Refrigerant Line for HVAC Systems

This 3/8" x 5/8" mini split line set is a high-performance HVAC solution designed for ductless air conditioners, heat pumps, and commercial cooling systems. Made from 99.9% pure copper with factory insulation, it ensures efficient refrigerant transfer, reduced energy loss, and long-term durability for demanding installations.

H2: Product Overview – Professional HVAC Copper Line Set

This line set includes a 3/8" liquid line and 5/8" suction line, pre-insulated and paired for easy installation.

• Copper purity: 99.9% (ASTM B280 & C12200)

• Available lengths: 15m / 20m / 25m / 30m / 50m

• Insulation: UV-resistant polypropylene / rubber foam

• Application: Mini split AC, heat pump, centralized HVAC

It is widely used for medium-capacity HVAC systems and long-distance installations.

H2: Key Features of 3/8" x 5/8" Mini Split Line Set

H3: High-Purity Copper for Maximum Efficiency

Manufactured with 99.9% pure copper, compliant with ASTM B280 and C12200 standards, ensuring excellent thermal conductivity, corrosion resistance, and long service life.

H3: High Pressure Rating for Modern Refrigerants

With a pressure rating of 2100–7000 PSI, this line set exceeds standard HVAC requirements and supports refrigerants like R410A and R32.

H3: Advanced Insulation for Energy Efficiency

The insulation uses closed-cell polypropylene or rubber foam, reducing heat transfer, improving cooling performance, and preventing energy loss.

H3: UV-Resistant & Flame-Retardant Design

The insulation meets multiple international standards:

• ASTM E84

• UL94

• ASTM D1056

• ASTM G21

Ensuring fire safety, UV protection, and long-term outdoor durability.

H2: Technical Specifications

H3: Copper Tube Dimensions

• Liquid Line: 3/8 inch (9.52 mm)

• Suction Line: 5/8 inch (15.88 mm)

H3: Insulation & Temperature Range

• Insulation Material: Polypropylene / Rubber Foam

• Working Temperature: -40°C to 120°C

H3: Compliance Standards

• ASTM B280 (Copper tubing)

• ASTM E84 (Fire resistance)

• UL94 (Flame retardant)

• ASTM D1056 / G21

These certifications ensure safety, durability, and HVAC compatibility.

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.

Applications – Designed for Medium to Large HVAC Systems

This insulated copper line set is widely used in:

• Mini split air conditioners

• Heat pump systems

• Commercial HVAC installations

• Centralized air conditioning systems

Typically suitable for 2–3 ton (18,000–36,000 BTU) systems depending on manufacturer specifications and installation conditions.

Benefits of Pre-Insulated Copper Line Sets

Enhanced Energy Efficiency

Minimizes thermal loss and improves overall HVAC system performance.

Condensation & Moisture Protection

Acts as a vapor barrier, preventing condensation damage in walls and ceilings.

Faster Installation

Pre-insulated and paired tubing reduces installation time and labor costs.

Long-Term Durability

Copper’s corrosion resistance combined with robust insulation ensures extended service life.

OEM & Customization Services

We offer flexible OEM/ODM solutions:

• Custom lengths (1m–50m or more)

• Insulation thickness & material options

• Logo printing on insulation

• Bulk packaging for distributors and contractors

Mini Split Line Set

1/4 + 3/8 Mini split line set 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 piping 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 Mini split 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 Mini split 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.

Why Choose 3/8" x 5/8" Mini Split Line Set from DABUND PIPE

We are manufacturer of mini split line set since 2008 years, have good experience of producing and exporting. We have cooperated 9 years forwarder, can guarantee the shipment. Every week we load at least 6-8 40HQ to different countries. Choose Dabund You will win the business.

Individual pre-insulated rolls to perfectly fit every ductless mini-splits, VRF, heat pumps and unitary systems installation.

Quality products with competitive pricing

Peace of mind with professional services

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 3/8" x 5/8" mini split line set used for?

It is used to connect indoor and outdoor units in HVAC systems, allowing refrigerant to circulate efficiently in mini split air conditioners and heat pumps.

2.What size air conditioner uses a 3/8" x 5/8" line set?

This size is typically used for 2–3 ton (18,000–36,000 BTU) air conditioning systems, depending on the manufacturer’s specifications.

3.Why is copper used for HVAC line sets?

Copper offers excellent thermal conductivity, corrosion resistance, and durability, making it the industry standard for refrigerant piping.

4.Why is insulation important for refrigerant line sets?

Insulation reduces heat loss, improves system efficiency, and prevents condensation, especially in humid or outdoor environments.

5.Is this line set compatible with R410A refrigerant?

Yes, it supports modern refrigerants like R410A and R32 due to its high pressure rating and ASTM compliance.

6.Can this insulated copper line set be used outdoors?

Yes, the insulation is UV-resistant, flame-retardant, and weatherproof, making it suitable for outdoor installations.

7.What standards does this copper line set meet?

It complies with ASTM B280, ASTM E84, UL94, and ASTM D1056, ensuring high safety and performance standards.

8.Can I customize the mini split line set?

Yes, OEM customization is available, including length, insulation type, branding, and packaging.

9.How do I choose the correct HVAC line set size?

The correct size depends on your air conditioner capacity (BTU/tonnage). Always follow the equipment manufacturer’s specifications for optimal performance.