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

Looking for a reliable and easy-to-install HVAC line set for residential systems? This 50 ft 1/4" x 3/8" mini split line set is designed for optimal refrigerant flow, energy efficiency, and long-lasting performance. Perfect for ductless mini split air conditioners and heat pumps, it ensures a clean, professional installation every time.

Product Overview – 50 ft Pre-Insulated Copper Line Set

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

• Liquid Line: 1/4" (6.35 mm)

• Suction Line: 3/8" (9.52 mm)

• Length: 50 ft (15.24 meters)

• Material: 99.9% pure copper

• Structure: Twin insulated copper pipes

Pre-insulated and pre-flared design makes installation faster and reduces the need for additional materials.

High-Quality Copper Tubing – Engineered for Durability

99.9% Pure Copper Meets ASTM Standards

Manufactured with high-purity copper compliant with ASTM B280 standards, ensuring:

• Excellent thermal conductivity

• Strong corrosion resistance

• Long service life

This guarantees reliable performance for HVAC and refrigeration systems.

Pre-Flared Ends for Easy Installation

The copper tubing typically comes with pre-flared ends and nuts, allowing quick connections without brazing or soldering, making installation easier and safer.

Advanced Insulation Technology for Energy Efficiency

UV-Resistant & Weatherproof Insulation

The insulation layer is designed to withstand harsh environments:

• UV-resistant for outdoor use

• Weatherproof and anti-aging

• Flame-retardant (UL compliant)

Triple-Layer Insulation Structure

Typical structure includes:

• Outer Layer: Embossed PE film

• Middle Layer: Insulation foam

• Inner Layer: Closed-cell structure

This multi-layer design improves insulation performance and durability.

Moisture & Condensation Protection

Closed-cell insulation prevents condensation and water penetration, protecting both the pipe and surrounding 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 50 ft Mini Split Line Set

Ideal Length for Standard Residential Installations

The 50 ft length is perfect for:

• Homes and apartments

• Standard wall-to-outdoor unit setups

• Moderate-distance installations

Improve Energy Efficiency & System Performance

Pre-insulated tubing minimizes heat exchange, helping your system operate efficiently and reduce energy consumption.

Fast Installation & Reduced Labor Cost

Factory insulation and pre-flared ends eliminate extra steps, saving installation time and labor costs.

Durable, Corrosion-Resistant & Long Service Life

Copper tubing offers excellent corrosion resistance, with a lifespan of 15–20 years or more under proper installation.

HVAC Applications – Wide Compatibility

This 1/4" + 3/8" mini split line set is widely used for:

• 9000 BTU mini split systems

• 12000 BTU air conditioners

• 18000 BTU systems (depending on design)

It is one of the most common configurations in residential HVAC systems.

Technical Specifications

OEM Customization & Manufacturing Options

Looking to build your HVAC brand?

We offer:

• Custom insulation colors (white / black)

• Logo printing on insulation

• Custom lengths (15m–50m+)

• OEM & ODM services

In-house production ensures stable quality and flexible customization.

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 DABUND Mini Split Line Set?

• Over 15 years of HVAC manufacturing experience

• Full in-house production (copper + insulation)

• Strict quality control standards

• Fast global shipping

• Competitive factory pricing

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

1.What is a 50 ft 1/4" x 3/8" 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.

2.What size HVAC system is this line set suitable for?

The 1/4" + 3/8" configuration is typically used for 9000–18000 BTU systems, making it ideal for residential applications.

3.Why choose a 50 ft line set instead of shorter lengths?

A 50 ft line set offers flexibility for installation, allowing proper placement of indoor and outdoor units without needing extensions.

4.Are pre-flared copper pipes better for installation?

Yes, pre-flared pipes eliminate the need for brazing or soldering, making installation faster, safer, and more reliable.

5.What type of insulation is used in this line set?

It typically uses closed-cell foam insulation with a multi-layer structure, providing thermal insulation, UV resistance, and moisture protection.

6.Can this mini split line set be used outdoors?

Yes, the UV-resistant insulation makes it suitable for outdoor installation, protecting against sunlight, rain, and temperature changes.

7.Is this copper line set compatible with R410A refrigerant?

Yes, it supports high-pressure refrigerants like R410A due to its strong pressure rating and compliance with HVAC standards.

8.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.

9.How long does a mini split line set last?

With proper installation, it can last over 15–20 years thanks to corrosion-resistant copper and durable insulation materials.