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DBJ-003
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DABUND
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Copper
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3-50m
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1/4,3/8,1/2,5/8,3/4,7/8,1,1-1/8
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3/8" x 5/8" Mini Split Refrigerant Line Set
The 3/8" x 5/8" mini split refrigerant line set is a high-quality pre-insulated copper HVAC pipe designed for ductless mini split air conditioners, heat pumps, central air conditioning systems and HVACR installations.
This line set includes a 3/8" liquid line and 5/8" suction line with factory-applied insulation. It helps maintain stable refrigerant flow, reduce energy loss, prevent condensation and protect copper tubing during indoor and outdoor HVAC installation.
Dabund supplies mini split refrigerant line sets, insulated copper pipes and HVAC installation parts for contractors, distributors, wholesalers, importers and OEM private-label buyers.
Product Overview
The 3/8" x 5/8" mini split refrigerant line set is a twin copper pipe assembly used to connect the indoor evaporator and outdoor condenser in compatible HVAC systems.
With precision insulation, high-purity copper tubing and durable outer protection, this insulated copper HVAC pipe supports efficient refrigerant transfer and long-term system reliability for residential and commercial installations.
Key Features of 3/8" x 5/8" Mini Split Refrigerant Line Set
Standard 3/8" x 5/8" copper pipe dimensions for compatible HVAC systems.
3/8" liquid line and 5/8" suction line for mini split and heat pump applications.
Metric outer diameter: 9.52 mm x 15.88 mm.
99.9% pure copper construction for reliable refrigerant flow.
Copper tubing can meet ASTM B280 and C12200 standards.
Factory-applied insulation helps reduce heat gain, heat loss and condensation.
UV-resistant insulation supports indoor and outdoor line set installation.
Temperature range from -40℃ to 120℃ for HVAC working conditions.
OEM printing and customized packaging are available for B2B buyers.
Standard 3/8" x 5/8" Copper Pipe Dimensions
3/8" Liquid Line
The 3/8" copper tube is commonly used as the liquid line in compatible mini split and HVAC systems. It carries refrigerant from the outdoor unit toward the indoor evaporator.
5/8" Suction Line
The 5/8" copper tube is commonly used as the suction line, returning refrigerant vapor from the indoor unit to the outdoor compressor.
Compatible HVAC Capacity Range
The 3/8" x 5/8" line set is commonly used for 3.0 ton to 4.0 ton ductless mini split systems and many 36,000 BTU to 48,000 BTU applications. Final line sizing should always follow the HVAC equipment manufacturer’s installation manual.
99.9% Pure Copper Construction
The copper tubing is manufactured from high-purity copper for excellent heat transfer, pressure resistance, corrosion resistance and long service life.
For professional HVAC and refrigeration applications, Dabund can supply copper pipe that meets ASTM B280 and C12200 standards, supporting reliable refrigerant transport in modern HVAC systems.
Advanced Insulation for Thermal Efficiency
UV-Resistant Insulation
The insulation jacket helps protect the copper tubing from sunlight, weather exposure, moisture and normal installation wear in indoor and outdoor environments.
Condensation Control
Factory-applied insulation reduces surface condensation on cold refrigerant lines, helping prevent water dripping, moisture damage and mold-related problems around walls and ceilings.
Energy Efficiency Support
Proper insulation helps maintain refrigerant temperature stability, reducing heat gain or heat loss during cooling and heating operation.
Technical Specifications
| Specification | Detail |
| Product Name | 3/8" x 5/8" Mini Split Refrigerant Line Set |
| Line Size | 3/8" x 5/8" |
| Metric Size | 9.52 mm x 15.88 mm |
| Common Function | 3/8" liquid line and 5/8" suction line |
| Copper Material | 99.9% pure copper |
| Copper Standard | ASTM B280 and C12200 options |
| Insulation | High-density UV-resistant insulation |
| Temperature Range | -40℃ to 120℃ |
| Pressure Rating | 2100 PSI to 7000 PSI options |
| Applications | Mini split AC, heat pump, ductless HVAC and central air conditioning systems |
99.9% Pure Copper
White PE Insulated Pipe
Plastic Cap Protection
Applications
Ductless mini split AC systems.
Heat pump refrigerant lines.
Central HVAC installations.
Residential air conditioning projects.
Commercial HVAC installations.
Replacement and retrofit refrigerant line projects.
This line set connects evaporator coils to condenser units while helping maintain optimal refrigerant flow, thermal efficiency and system performance.
Packaging and Shipping Options
The mini split refrigerant line set is available in multiple lengths from 15 m up to 50 m. Secure export packaging, OEM branding and customized packaging are available for international distributors and wholesale buyers.
Mini Split Refrigerant Line Set for HVACR Wholesalers
Dabund Pipe in-house tested insulated copper pipe and tubing is designed to make installation simple and quick, helping contractors save time and reduce cost on each job.
For distributors and private-label HVAC brands, Dabund supports custom length, insulation thickness, printed company name, size marking and export packaging.
Mini Split Refrigerant Line Set Size Options
| 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 |
Recommended Applications by AC Capacity
| Line Set Size | Common AC Capacity | Typical BTU Range | Typical Application |
| 1/4 + 3/8 | 0.75 ton - 1.0 ton | 9,000 BTU - 12,000 BTU | Small mini split air conditioner |
| 1/4 + 1/2 | 1.5 ton - 2.0 ton | 12,000 BTU - 18,000 BTU | Residential mini split system |
| 1/4 + 5/8 | 2.0 ton - 2.5 ton | 24,000 BTU - 30,000 BTU | Split air conditioner system |
| 3/8 + 5/8 | 3.0 ton - 4.0 ton | 36,000 BTU - 48,000 BTU | Ductless mini split and heat pump |
| 3/8 + 3/4 | 4.5 ton - 6.0 ton | 54,000 BTU - 72,000 BTU | Larger split AC installation |
| 3/8 + 7/8 | 6.0 ton - 8.0 ton | 72,000 BTU - 96,000 BTU | Commercial ductless HVAC systems |
Why Choose This Mini Split Refrigerant Line Set?
Ready-to-Install Pre-Insulated Design
The line set arrives factory-insulated and ready for installation, reducing onsite labor time and helping installers create a consistent result.
Durable and Weather-Resistant
UV-resistant insulation and pure copper tubing help resist corrosion, outdoor exposure and environmental wear, extending service life.
Optimized for Energy Efficiency
Proper insulation minimizes heat gain and condensation, helping HVAC systems operate more efficiently and reducing unnecessary energy waste.
OEM and Bulk Supply Support
Dabund supports customized line length, insulation thickness, product printing, logo marking, packaging design and bulk export supply.
Dabund Factory
Dabund produces insulated copper pipe, mini split line set, aluminum pipe and HVAC parts for global customers.
SGS Certificate
Mini split line set insulation can be made of polypropylene or black rubber with UV resistance, meeting ASTM E84, UL94, ASTM D1056 and ASTM G21 requirements.
Exhibition
Dabund joins HVAC exhibitions worldwide to present mini split line set and HVAC installation products to customers face to face.
FAQ
What is a mini split refrigerant line set?
A mini split refrigerant line set is a pair of copper tubes used to connect the indoor and outdoor units of a mini split air conditioner or heat pump system. It allows refrigerant to circulate between the two units.
What is 3/8" x 5/8" mini split refrigerant line set used for?
It is used for compatible ductless mini split AC systems, heat pumps and HVAC installations that require a 3/8" liquid line and 5/8" suction line.
What sizes are available for mini split line sets?
Common line set sizes include 1/4" x 3/8", 1/4" x 1/2", 1/4" x 5/8", 3/8" x 5/8", 3/8" x 3/4", 1/2" x 3/4" and 3/8" x 7/8".
Are mini split refrigerant line sets pre-insulated?
Yes. Most mini split refrigerant line sets are pre-insulated with closed-cell foam insulation to reduce energy loss, prevent condensation and protect copper tubing.
What type of copper is used in refrigerant line sets?
High-quality refrigerant line sets use 99.9% pure copper tubing. Dabund can supply copper tubing that meets ASTM B280 and C12200 standards for HVAC applications.
Are these line sets compatible with all mini split brands?
They can be used with many mini split brands when the line size, length, pressure rating and flare connection match the equipment specifications. Always check the installation manual before purchase.
What lengths do mini split refrigerant line sets come in?
Common lengths include 10 ft, 15 ft, 25 ft, 50 ft, 75 ft and 100 ft. Dabund can also provide metric lengths such as 15 m, 20 m, 25 m, 30 m and 50 m.
Can mini split line sets be cut or extended?
Yes. Copper line sets can be cut to the required length or extended using proper HVAC methods. Professional cutting, deburring, flaring, brazing and leak testing are recommended.
Are mini split refrigerant line sets suitable for outdoor use?
Yes. Pre-insulated line sets with UV-resistant insulation are suitable for indoor and outdoor use when installed correctly and protected according to project requirements.
Do refrigerant line sets support R410A and R32 refrigerants?
Yes. Modern mini split refrigerant line sets can support high-pressure refrigerants such as R410A and R32 when the copper tubing and installation meet system requirements.
Why is proper insulation important for refrigerant line sets?
Proper insulation reduces heat gain or loss, improves system efficiency, prevents condensation and helps avoid water damage around walls, ceilings and building materials.
Can Dabund customize mini split refrigerant line sets?
Yes. Dabund can customize pipe size, line length, insulation thickness, insulation material, product printing, logo marking and export packaging for OEM and wholesale buyers.
