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DBJ-003
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DABUND
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Copper
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1M - 10M
Material
Color
Keywords
Application
Dabund Brand 25 ft 1/4" x 5/8" Pre-Insulated Copper Tubing
Dabund brand 25 ft 1/4" x 5/8" pre-insulated copper tubing is designed for mini split air conditioners, heat pumps, split HVAC systems and refrigeration applications that require reliable refrigerant transfer and easy installation.
This HVAC mini split line set includes a 1/4" liquid line and a 5/8" suction line with factory-applied insulation. It helps maintain refrigerant temperature, reduce energy loss, prevent condensation and improve long-term system performance.
Made from 99.9% pure copper and available with white PE or black rubber insulation, this pre-insulated copper tubing is suitable for HVAC contractors, wholesalers, distributors, importers and private-label HVAC brands.
What Is Pre-Insulated Copper Tubing?
Pre-insulated copper tubing, also called an HVAC line set, combines copper refrigerant pipes with a factory-applied insulation layer. It connects the indoor and outdoor units of a mini split or HVAC system.
A high-quality HVAC line set helps maintain refrigerant temperature, prevent condensation, reduce heat gain or heat loss and improve air conditioning system efficiency.
Why Choose Dabund Brand Pre-Insulated Copper Tubing?
HVAC Manufacturing Experience Since 2008
Dabund has manufactured HVAC components since 2008, supplying insulated copper pipe, mini split line sets, aluminum pipe and HVAC parts for global customers.
99.9% Pure Copper with ASTM Standards
The copper tubing is made from 99.9% pure copper and can meet ASTM B280 and C12200 standards. It provides strong thermal conductivity, reliable pressure resistance and stable refrigerant flow.
Pre-Flared Ends with Nuts
Pre-flared ends and supplied nuts help reduce installation time and support secure refrigerant line connections for HVAC installers.
What Makes a High-Quality Copper Line Set?
A premium HVAC copper line set should use high-purity copper, accurate pipe dimensions, factory-applied insulation, pre-flared ends and high pressure tolerance for modern refrigerants.
High-purity copper with 99.9% copper content.
Factory insulation with UV-resistant and flame-retardant options.
Accurate 1/4" liquid line and 5/8" suction line sizing.
Pre-flared ends for easier installation.
High pressure resistance for modern HVAC refrigerants.
OEM printing and packaging options for distributors and brands.
Key Features of Dabund 25 ft Copper Line Set
25 ft pre-insulated copper tubing for mini split and HVAC installation.
1/4" liquid line and 5/8" suction line for compatible systems.
Commonly used for 2.0 ton to 2.5 ton mini split air conditioners.
Suitable for many 24,000 BTU to 30,000 BTU HVAC systems.
Factory insulation helps reduce heat transfer and condensation.
Black rubber and PE insulation options are available.
Operating temperature range from -40℃ to 120℃.
Pressure rating options from 2100 PSI to 7000 PSI.
Supports mini split AC, heat pump and refrigeration applications.
OEM, ODM, logo printing and custom packaging are available.
Twin Copper Tubing: 1/4" + 5/8"
This line set includes two copper refrigerant lines: a 1/4" liquid line and a 5/8" suction line. The 25 ft length is suitable for many standard residential and light commercial HVAC installations.
1/4" Liquid Line
The 1/4" copper tube is commonly used as the liquid line, carrying high-pressure refrigerant from the outdoor unit toward the indoor evaporator coil.
5/8" Suction Line
The 5/8" copper tube is commonly used as the suction line, returning low-pressure refrigerant vapor from the indoor unit to the outdoor compressor.
Multi-Layer Insulation System
The insulation system helps protect the copper tubing from heat transfer, condensation, UV exposure, moisture and outdoor environmental stress.
Outer layer: UV-resistant PE film or black rubber protection.
Middle layer: high-density IXPE foam for thermal insulation.
Inner layer: closed-cell insulation for moisture resistance.
Provides waterproofing, durability and thermal stability.
Helps reduce installation failure caused by insulation damage or condensation.
Flame-Retardant and Safety Tested Insulation
Dabund insulation options can meet ASTM E84, UL94, ASTM D1056 and ASTM G21 requirements. SGS-tested insulation helps support safer HVAC installation in residential, commercial and export markets.
The insulation is designed for demanding environments, with a working temperature range from -40℃ to 120℃.
99.9% Pure Copper
Black Rubber Insulated Pipe
Pre-Flared End
Features of Black Rubber Pipe Insulation
Black rubber insulation is suitable for HVAC copper line sets that need thermal protection, moisture resistance and flexible installation performance.
Temperature range from -40℃ to 120℃.
Moisture condensation control for refrigerant lines.
Insulation layer also works as a moisture-proof layer.
No additional vapor barrier is required in many standard applications.
Suitable for indoor and outdoor HVAC installation environments.
Best Line Set Size for Mini Split Systems
The 1/4" x 5/8" line set is commonly used for 2.0 ton to 2.5 ton mini split systems and many 24,000 BTU to 30,000 BTU air conditioners.
This makes it a practical choice for medium-capacity residential HVAC systems and light commercial cooling applications. Final line set selection should always follow the HVAC equipment manufacturer’s installation manual.
Complete HVAC Installation Solution
Dabund can also supply this product as part of a mini split installation kit, helping HVAC installers source all key components from one supplier.
Pre-insulated copper tubing.
Communication wire.
Drain hose.
Wall sleeve and cover.
Flare nuts and installation accessories.
Why Pre-Insulated Copper Tubing Improves Efficiency
Using pre-insulated copper tubing helps reduce heat loss, prevent condensation, maintain stable refrigerant flow and improve HVAC system lifespan.
Reduces unwanted heat transfer along the refrigerant line.
Helps prevent water damage caused by condensation.
Supports stable refrigerant temperature and system efficiency.
Reduces field insulation work for HVAC installers.
Improves long-term protection for copper refrigerant lines.
Applications of Dabund Pre-Insulated Copper Tubing
Mini Split Air Conditioners
Suitable for compatible mini split AC systems, especially many 2.0 ton to 2.5 ton and 24,000 BTU to 30,000 BTU systems.
Heat Pump Systems
Supports efficient heating and cooling transfer between indoor and outdoor heat pump units.
Residential and Light Commercial HVAC Projects
Designed for residential installation, light commercial air conditioning, replacement line set projects and HVACR supply channels.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand | Dabund |
| Product Name | 25 ft 1/4" x 5/8" Pre-Insulated Copper Tubing |
| Size | 1/4" + 5/8" |
| Length | 25 ft |
| Material | 99.9% pure copper |
| Insulation | PE / black rubber |
| Temperature Range | -40℃ to 120℃ |
| Standards | ASTM B280, UL94, ASTM E84 |
| Pressure Rating | 2100 PSI to 7000 PSI |
| Application | HVAC, mini split, heat pump and refrigeration |
Pre-Insulated Copper Tubing Size Options
| Size | Length | Insulation Black Rubber | Flame Resistant |
| 1/4 + 3/8 | 3m / 4m / 5m / 7m / 10m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 1/4 + 1/2 | 3m / 4m / 5m / 7m / 10m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 1/4 + 5/8 | 3m / 4m / 5m / 7m / 10m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 3/8 + 5/8 | 3m / 4m / 5m / 7m / 10m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 3/8 + 3/4 | 3m / 4m / 5m / 7m / 10m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 1/2 + 3/4 | 3m / 4m / 5m / 7m / 10m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 3/8 + 7/8 | 3m / 4m / 5m / 7m / 10m | 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 |
How to Choose the Right HVAC Line Set Supplier
When selecting an HVAC line set supplier, buyers should evaluate manufacturing experience, product certifications, customization capability, delivery reliability and export support.
Dabund supports factory-direct pricing, stable quality control, OEM and ODM customization, global shipping and one-stop HVAC product supply.
Dabund Manufacturing Advantages
Large Production Capacity
Dabund supports bulk production for HVAC distributors, importers and private-label brands, with production capacity suitable for large-volume HVAC line set orders.
OEM and ODM Customization
Custom logo printing, insulation thickness, product marking and tailored packaging are available for brand owners and wholesale buyers.
Global Export Experience
Dabund supplies customers worldwide with consistent product quality, reliable logistics and HVAC product solutions for different market requirements.
Packaging and Delivery
Standard export packaging is available.
Custom packaging can be provided for OEM orders.
Normal delivery time is usually 15 to 20 days.
Urgent orders can be arranged according to factory schedule.
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 with polypropylene or black rubber with UV resistance, meeting ASTM E84, UL94, ASTM D1056 and ASTM G21 requirements.
Exhibition
Dabund joins HVAC exhibitions worldwide to help customers experience mini split line set and HVAC installation products face to face.
FAQ
What is 25 ft 1/4" x 5/8" pre-insulated copper tubing used for?
It is used as an HVAC refrigerant line set for mini split air conditioners, heat pumps and refrigeration systems that require a 1/4" liquid line and 5/8" suction line.
What HVAC system size is this line set suitable for?
The 1/4" x 5/8" line set is commonly used for 2.0 ton to 2.5 ton systems, including many 24,000 BTU to 30,000 BTU mini split air conditioners.
Is the copper tubing pre-flared?
Yes. Both ends can be supplied pre-flared with nuts to support faster and more secure HVAC installation.
What insulation options are available?
Dabund can provide white PE and black rubber insulation with multiple thickness options, including 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm.
Is this line set compatible with R410A and R32 refrigerants?
Yes. This pre-insulated copper tubing can be used with common HVAC refrigerants such as R410A and R32 when installed according to system requirements and local codes.
Can this product be customized?
Yes. Dabund offers OEM and ODM services, including custom insulation thickness, logo printing, size marking, product labeling and custom packaging.
Are you a trading company or manufacturer?
Dabund is a manufacturer of pre-insulated copper tubing, mini split line sets, aluminum pipe and HVAC parts.
Can I get a free sample?
Yes. Dabund can provide qualified customers with 3 pieces of free samples. Express cost may need to be covered by the buyer. You can request samples through the free sample page.
Can I print my logo?
Yes. Dabund accepts OEM and ODM orders, including logo printing, brand marking and customized packaging.
What payment terms are available?
Payment terms may include T/T, L/C at sight, credit card and other agreed payment methods depending on order details.
What delivery terms can you offer?
Dabund can offer common international trade terms such as EXW, FOB, CFR and CIF.
How long is your delivery time?
Normal delivery time is usually 15 to 20 days. For urgent orders, production and shipment can be arranged in advance according to factory schedule.
