1/4" x 3/8" x 25 ft Mini Split Line Set for HVAC & Air Conditioning Systems

Looking for a reliable and easy-to-install HVAC line set for short-distance applications? This 1/4" x 3/8" x 25 ft mini split line set is designed for efficient refrigerant flow, fast installation, and long-lasting durability—perfect for residential ductless air conditioning systems.

25 ft Mini Split Line Set is two tubes tied together with insulating tape, unlike White Embossed Copper Tube, two tubes can be glued together. For the convenience of transportation, we will pack the tubes very neatly and beautifully. So buy it now.

Product Overview – 25 ft Pre-Insulated Copper Line Set

This insulated copper line set provides a complete solution for connecting indoor and outdoor units in HVAC systems.

• Liquid Line: 1/4" (6.35 mm)

• Suction Line: 3/8" (9.52 mm)

• Length: 25 ft (7.6 meters)

• Material: 99.9% pure copper

• Structure: Twin insulated copper pipes

It is one of the most commonly used sizes for small-capacity mini split systems.

Premium Copper Tubing – Built for Performance

99.9% Pure Copper Meets ASTM Standards

Manufactured using C12200 copper and compliant with ASTM B280 standards, this line set ensures:

• Excellent thermal conductivity

• Strong corrosion resistance

• Long service life

This guarantees stable and reliable HVAC system performance.

High Pressure Resistance for Modern Refrigerants

With a pressure rating of 2100–7000 PSI, this copper tubing supports modern refrigerants such as R410A, ensuring safe and efficient operation even under high pressure.

 Advanced Insulation Technology for Energy Efficiency

UV-Resistant & Weatherproof Insulation

The insulation is made from high-quality polypropylene or polyethylene materials, offering:

• UV resistance for outdoor installations

• Flame retardancy (UL94 compliant)

• Wide temperature range from -40℃ to 120℃

Triple-Layer Insulation Structure

• Outer Layer: UV-resistant embossed PE film

• Middle Layer: High-density insulation foam

• Inner Layer: Closed-cell airtight structure

This multi-layer design improves thermal efficiency and durability.

Moisture & Condensation Protection

The closed-cell insulation prevents moisture penetration and condensation, protecting both the copper pipe and building structures.

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.

Key Benefits of 25 ft Mini Split Line Set

Ideal for Short Distance Installations

The 25 ft length is perfect for:

• Standard residential setups

• Indoor-to-outdoor wall installations

• Compact HVAC layouts

Optimized for Small HVAC Systems

The 1/4" + 3/8" size is typically used for:

• 9000 BTU mini split systems

• 12000 BTU systems

• 0.75–1.0 ton air conditioning units

 Improve Energy Efficiency & System Performance

Pre-insulated copper tubing reduces heat exchange, allowing your HVAC system to operate efficiently and lower energy consumption.

Fast Installation & Reduced Labor Cost

Factory-applied insulation and optional pre-flared ends reduce installation time and eliminate additional materials.

Durable, Corrosion-Resistant & Long Service Life

Copper’s natural corrosion resistance ensures a lifespan of 15–20 years or more with proper installation.

HVAC Applications – Wide Compatibility

This 25 ft 1/4" x 3/8" line set is suitable for:

• Ductless mini split systems

• Heat pumps

• Residential HVAC installations

• Small commercial cooling systems

Technical Specifications

OEM Customization & Manufacturing Capabilities

Looking to grow your HVAC business?

We offer:

• Custom insulation colors (black / white)

• Logo printing on insulation

• Custom lengths (15m–50m+)

• OEM & ODM services

In-house insulation production ensures stable quality and flexible customization.

Mini Split Line Set

1/4 + 3/8 AC 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 Line set for mini split 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 piping apply for 72K - 96K ductless mini split air conditioner.

## Why Choose DABUND Mini Split Line Set?

• Over 15 years of HVAC manufacturing experience

• Full in-house production (copper + insulation)

• Strict international quality standards

• Competitive factory pricing

• Global export capability

DABUND provides a one-stop HVAC solution for contractors, distributors, and OEM buyers.

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

What is a 1/4" x 3/8" x 25 ft mini split line set used for?

This line set is used to connect indoor and outdoor units in mini split air conditioning systems, allowing refrigerant to circulate efficiently.

What size HVAC system is this line set suitable for?

It is typically used for 9000–12000 BTU systems or 0.75–1.0 ton air conditioners, making it ideal for residential applications.

 Why choose a 25 ft line set instead of longer options?

A 25 ft line set is ideal for standard installations where the indoor and outdoor units are relatively close, reducing excess piping and improving efficiency.

Is this copper line set compatible with R410A refrigerant?

Yes, it supports high-pressure refrigerants like R410A due to its pressure rating of up to 7000 PSI.

What type of insulation is used in this product?

It uses UV-resistant PE or polypropylene insulation with a closed-cell structure, providing excellent thermal insulation and moisture protection.

Can this mini split line set be used outdoors?

Yes, the UV-resistant and weatherproof insulation makes it suitable for outdoor installations.

What are the advantages of pre-insulated copper line sets?

They save installation time, ensure consistent insulation quality, reduce energy loss, and prevent condensation problems.

Can I customize this HVAC line set for my brand?

Yes, OEM and ODM services are available, including custom branding, insulation color, printing, and packaging.

How long does a mini split line set last?

With proper installation, it can last over 15–20 years due to its corrosion resistance and durable insulation materials.