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50 ft 3/8" x 5/8" Mini Split Long Line Set Sizes

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50 ft 3/8″ x 5/8″ Mini Split Long Line Set – Insulated Copper Refrigerant Lines

1. 3/8" x 5/8" is the out dimension in inch. 9.52mm - 15.88mm is the out dimension in metric.

2. 99.9% Pure copper pipe meets ASTM B280 and C12200 standard.

3. AC Copper Size what we can do have following 1/4" 3/8" 1/2" 5/8" 3/4" 7/8" 1 1/8", length can do 15m 20m 25m 30m 50m.

4. Insulation is made of 1/2" Polypropylene & UV Resistant, meets ASTM E 84, UL94, ASTM D1056 and ASTM G 21. Working temperature from -40℃ to 120℃.

5. Works for every Air Conditioning & Refrigeration Application including Ductless mini-split, heat pump and Centralized Air Ducted Units.

6. Pressure Rating: 2100 to 7000 PSI, much more than required 700 PSI for R410.

7. Insulation we produce by ourself, can print your company name, size, meters etc.

Model:
DBJ-003
Brand:
DABUND
Material:
Copper
Length:
1M - 50M

Material:	99.9% pure copper
Color:	Black/White
Keywords:	Mini Split Line Set
Application:	HVAC
Availability:

Quantity:



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Product Description

Premium 50-foot long line set featuring 3/8″ liquid line and 5/8″ suction line, designed for extended-distance mini split, ductless air conditioner, and heat pump installations.

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

H2: Product Overview – Long Line Set for Extended Mini Split Installations

The 50 ft 3/8″ x 5/8″ mini split long line set is engineered for installations where standard line lengths are insufficient. With factory-insulated copper tubing, it ensures reliable refrigerant flow, thermal efficiency, and long-term durability in residential and light commercial HVAC systems.

H3: Long 50 ft Length for Flexible Installation Layouts

Ideal for multi-room layouts, second-floor installations, or longer indoor-to-outdoor unit distances
Reduces the need for on-site line extensions or couplings
Supports clean, continuous refrigerant runs for better system efficiency

H3: Standard 3/8″ x 5/8″ Line Sizes

3/8″ liquid line and 5/8″ suction line
One of the most commonly used size combinations for mini split and ductless AC systems
Compatible with a wide range of popular mini split brands and capacities

H2: High-Quality Insulated Copper Tubing

H3: 99.9% Pure Copper for HVAC Performance

Manufactured from 99.9% pure copper, this long line set provides excellent thermal conductivity, pressure resistance, and corrosion protection — meeting the demands of modern HVAC refrigerant systems.

H3: Factory-Applied Insulation for Energy Efficiency

Closed-cell insulation minimizes heat loss and gain
Prevents condensation and moisture buildup
Saves installation time by eliminating field-applied insulation

H3: UV-Resistant Insulation for Outdoor Use

The insulation jacket is UV-resistant and suitable for both indoor and outdoor applications, helping maintain performance even under direct sunlight and varying weather conditions.

H2: Compatibility & Applications

H3: Designed for Mini Split & Ductless AC Systems

This 50 ft long line set is widely used in:

Mini split air conditioners
Ductless heat pump systems
Residential and light commercial HVAC installations

H3: Compatible with Modern Refrigerants

The copper tubing and insulation are suitable for common refrigerants such as R410A, R32, and similar HVAC refrigerants, supporting high-pressure system requirements.

H2: Key Benefits of a 50 ft Mini Split Long Line Set

H3: Fewer Connections, Lower Leak Risk

Using a single 50 ft line set reduces the need for couplings or extensions, minimizing potential refrigerant leak points and improving system reliability.

H3: Cleaner Installation Appearance

A continuous long line set provides a neater, more professional finish compared to joined or spliced refrigerant lines.

H3: Ideal for Professional & Large-Scale Installations

Preferred by HVAC contractors for projects that require longer runs, flexible routing, and consistent insulation quality.

99.9% Pure Copper

White PE Insulated Pipe

Plastic Cap

Features of pipe insulation tubing:

White PE Embossed insulated pipe

Machines for the production of thermal insulation pipes

warehouse for insulation pipes

Inner Layer Insulated Pipe

H2: Technical Specifications

Line Set Length: 50 ft (15.24 m)
Line Sizes: 3/8″ liquid line × 5/8″ suction line
Material: 99.9% pure copper tubing
Insulation: Factory-applied, closed-cell, UV-resistant
Applications: Mini split AC, ductless systems, heat pumps

H2: Installation Tips for Long Line Sets

H3: Verify Maximum Line Length per AC Manufacturer

Always confirm that the total refrigerant line length complies with the mini split manufacturer’s specifications to ensure optimal system performance.

H3: Avoid Tight Bends and Insulation Damage

Plan routing carefully to maintain smooth bends and protect the insulation jacket during installation.

H3: Secure Lines Properly for Long Runs

Use appropriate clamps or line covers to support the tubing over long distances and reduce vibration or mechanical stress.

50 ft 3/8" x 5/8" Mini Split Long Line Set for HVACR Applications Wholesaler & Supplier

DABUND PIPE in-house tested insulate copper pipe and tubing is designed to make installation simple and quick – saving you time and money on each job.

White PE copper line set

Mini Split 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 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 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 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 HVAC lineset 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 HVAC lineset 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.

H2: Why Choose This 50 ft 3/8″ x 5/8″ Mini Split Line Set?

H3: Built for Efficiency, Durability & Professional Results

With premium copper, durable insulation, and extended length, this long line set supports efficient system operation, easier installation, and long-term reliability.

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.

AHR EXPO

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 5/8″ mean in a mini split line set?

It refers to the outer diameters of the refrigerant lines — 3/8″ for the liquid line and 5/8″ for the suction line.

8.When should I choose a 50 ft long line set instead of a shorter one?

A 50 ft line set is recommended when the distance between the indoor and outdoor units exceeds standard lengths (15–25 ft) or when routing requires additional flexibility.