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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
25 ft 1/4" x 3/8" Insulated Copper Tube
The 25 ft 1/4" x 3/8" insulated copper tube is a complete HVAC line set solution designed for mini split air conditioners, ductless AC systems, heat pumps and residential HVAC installations.
This kit includes one set of 1/4" x 3/8" insulated copper pipe with black rubber insulation, wire cable, wall pipe with cover, drain hose and necessary installation accessories for heating, ventilation and cooling systems.
Dabund Pipe manufactures insulated copper tube, mini split line sets, HVAC refrigerant tubing and installation accessories for contractors, distributors, wholesalers, importers and OEM private-label buyers.
Product Overview: 25 ft Insulated Copper Tube for Mini Split AC
The 25 ft 1/4" x 3/8" insulated copper tube is used to connect the indoor and outdoor units of compatible mini split and split AC systems.
The 25 ft length is suitable for common residential installations where the indoor unit and outdoor condenser are installed at a moderate distance. Factory insulation helps reduce energy loss, prevent condensation and protect the copper tubing during indoor and outdoor use.
Key Features of 25 ft 1/4" x 3/8" Insulated Copper Tube
25 ft insulated copper tube for mini split AC and HVAC installation.
1/4" and 3/8" copper refrigerant line sizes for compatible systems.
Includes communication wire cable, 3 m drain hose, wall pipe, cover and necessary accessories.
Both copper pipe ends can be flared and supplied with nuts.
Black rubber insulation helps reduce heat transfer and moisture condensation.
White PE and black rubber insulation options are available.
Copper pipe can meet ASTM B280 and C12200 standards.
Insulation options support ASTM E84, UL94, ASTM D1056 and ASTM G21 test requirements.
OEM logo printing, insulation marking and private-label packaging are available.
Complete Kit Components
| Component | Function |
| 1/4" Copper Refrigerant Line | Used as the smaller refrigerant line in compatible mini split systems. |
| 3/8" Copper Refrigerant Line | Used as the matching larger refrigerant line in compatible HVAC systems. |
| Black Rubber Insulation | Helps reduce thermal loss, condensation and outdoor exposure damage. |
| Communication Wire Cable | Supports indoor and outdoor unit communication where applicable. |
| Drain Hose | Helps discharge condensate from the indoor unit. |
| Wall Pipe and Cover | Protects the wall opening and creates a cleaner installation finish. |
| Flaring and Nuts | Support secure refrigerant line connections during installation. |
Technical Specifications
| Specification | Detail |
| Product Name | 25 ft 1/4" x 3/8" Insulated Copper Tube |
| Length | 25 ft / approx. 7.62 m |
| Line Set Size | 1/4" x 3/8" |
| Metric Size | 6.35 mm x 9.52 mm |
| Copper Material | 99.9% pure copper tubing |
| Copper Standard | ASTM B280 and C12200 DHP options |
| Insulation Material | Black rubber insulation / white PE insulation options |
| Temperature Range | -40℃ to 120℃ |
| Included Accessories | Wire cable, drain hose, wall pipe, cover, flaring and nuts |
| Application | Mini split AC, ductless HVAC, heat pump and HVACR installation |
Copper Tube: ASTM B280 and C12200 DHP
The copper tube is designed for HVAC refrigerant line performance. ASTM B280 and C12200 DHP copper options support excellent thermal conductivity, pressure resistance, corrosion resistance and long-term reliability.
99.9% Pure Copper Tubing
High-purity copper helps maintain stable refrigerant flow and strong heat transfer performance, making it suitable for mini split AC and HVACR systems.
Pre-Flared Ends with Nuts
Both copper pipe ends can be flared and supplied with nuts, helping installers create secure refrigerant connections and reduce preparation time.
Insulation Options and Performance
Dabund can provide white PE insulation and black rubber insulation for insulated copper tube products. Insulation thickness can be customized based on market requirements, installation environment and buyer specifications.
White PE thickness options: 3/8", 1/2", 3/4", 1", 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm.
Black rubber thickness options: 1/2", 3/4", 1", 13 mm, 17 mm, 19 mm and 25.4 mm.
High-density closed-cell insulation helps reduce heat loss and condensation.
UV-resistant surface helps protect outdoor HVAC line runs.
Insulation options can support ASTM E84, UL94, ASTM D1056 and ASTM G21 requirements.
99.9% Pure Copper
Black Rubber Insulated Pipe
Flaring
Black Rubber Pipe Insulation Features
Pipe insulation material: black rubber.
Temperature range from -40℃ to 120℃.
Closed-cell structure helps reduce moisture condensation.
Insulation material works as both a thermal insulation layer and a moisture-proof layer.
No additional water vapor permeation protective layer is required in many standard installations.
Helps protect copper pipe from heat transfer, moisture, abrasion and outdoor exposure.
Key Benefits of 25 ft Insulated Copper Tube
Excellent Heat Preservation
The high-density closed-cell insulation has low thermal conductivity and helps maintain stable refrigerant temperature during HVAC operation.
Condensation Control
The insulation layer helps reduce pipe sweating and moisture condensation, protecting walls, ceilings and nearby building materials from water damage.
Faster Installation
Factory-insulated copper tubing and supplied accessories help installers save time and reduce on-site preparation work.
Long-Term Protection
The insulation protects the copper tube from moisture, abrasion, outdoor exposure and normal installation wear, supporting longer HVAC system service life.
25 ft 1/4" x 3/8" Insulated Copper Tube for HVACR Wholesalers
Dabund Pipe in-house tested insulated copper tube is designed to make installation simple and quick, helping HVAC contractors save time and reduce cost on each job.
For distributors, importers and private-label HVAC brands, Dabund supports bulk production, custom insulation thickness, product marking, logo printing and export packaging.
Insulated Copper Tube Size Options
| Size | Length | Insulation Black Rubber | Flame Resistant |
| 1/4 + 3/8 | 3 m / 4 m / 5 m / 7 m / 10 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 1/4 + 1/2 | 3 m / 4 m / 5 m / 7 m / 10 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 1/4 + 5/8 | 3 m / 4 m / 5 m / 7 m / 10 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 3/8 + 5/8 | 3 m / 4 m / 5 m / 7 m / 10 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 3/8 + 3/4 | 3 m / 4 m / 5 m / 7 m / 10 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 1/2 + 3/4 | 3 m / 4 m / 5 m / 7 m / 10 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 3/8 + 7/8 | 3 m / 4 m / 5 m / 7 m / 10 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | 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 |
The 1/4" x 3/8" insulated copper tube is commonly used for 0.75 ton to 1.0 ton mini split systems and many 9,000 BTU to 12,000 BTU applications. Final sizing should always follow the equipment manufacturer’s requirements.
Why Choose 25 ft 1/4" x 3/8" Insulated Copper Tube from Dabund?
Manufacturer Experience Since 2008
Dabund Pipe has manufactured insulated copper tube, mini split line sets, aluminum pipe and HVAC parts since 2008, supporting global customers with production and export experience.
Large Production Capacity
Dabund operates professional production facilities and supports large-volume insulated copper tube supply for distributors, importers and project-based HVAC buyers.
Individual Pre-Insulated Rolls
Individual pre-insulated rolls are designed to fit ductless mini splits, VRF systems, heat pumps and unitary HVAC system installations.
Quality Products with Competitive Pricing
Dabund supports HVAC wholesalers, contractors, installers and private-label buyers with stable supply, competitive pricing and professional service.
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 insulated copper tube products to customers face to face.
FAQ
What is 25 ft 1/4" x 3/8" insulated copper tube used for?
It is used as a pre-insulated refrigerant line set for mini split air conditioners, ductless HVAC systems, heat pumps and split AC installations.
What does 1/4" x 3/8" mean?
It refers to the outer diameters of the two copper refrigerant tubes. The metric sizes are approximately 6.35 mm and 9.52 mm.
What AC capacity is 1/4" x 3/8" commonly used for?
This line set size is commonly used for 0.75 ton to 1.0 ton mini split systems and many 9,000 BTU to 12,000 BTU applications.
Does this insulated copper tube include accessories?
Yes. This kit can include communication wire cable, drain hose, wall pipe, cover, flared ends, nuts and necessary installation accessories.
Is this copper tube pre-flared?
Yes. Both copper pipe ends can be flared and supplied with nuts to support secure refrigerant line connections.
What insulation options are available?
Dabund can provide white PE insulation and black rubber insulation with different thickness options, including 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm.
Does the copper tube meet HVAC standards?
Yes. The copper tube can meet ASTM B280 and C12200 standards, while insulation options can support ASTM E84, UL94, ASTM D1056 and ASTM G21 test requirements.
Is this insulated copper tube suitable for outdoor use?
Yes. UV-resistant insulation is suitable for many indoor and outdoor HVAC line runs when installed correctly and protected according to project requirements.
Can Dabund customize this insulated copper tube?
Yes. Dabund can customize length, insulation thickness, insulation color, logo printing, product marking and export packaging for OEM and private-label buyers.
Are you a trading company or manufacturer?
Dabund is a manufacturer of insulated copper tube, mini split line sets, aluminum pipe and HVAC parts.
Can I get a free sample?
Yes. Dabund can provide qualified customers with 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, size printing, meter 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 according to factory schedule.
