-
DBJ-003
-
DABUND
-
Copper
-
1M - 50M
Material
Color
Keywords
Application
1/4" x 3/8" x 50 ft Insulated Copper Pipe
The 1/4" x 3/8" x 50 ft insulated copper pipe is a high-quality HVAC refrigerant line set designed for mini split air conditioners, ductless AC systems, heat pumps and residential HVAC installations.
This insulated copper pipe set includes a 1/4" liquid line and a 3/8" suction line with factory-applied insulation. It helps deliver reliable refrigerant flow, improved thermal efficiency and condensation control for indoor and outdoor HVAC applications.
Dabund supplies insulated copper pipe, mini split line sets, HVAC refrigerant lines and AC installation accessories for contractors, distributors, wholesalers, importers and OEM private-label buyers.
Product Overview: High-Quality Insulated Copper Refrigerant Line
This 50 ft 1/4" x 3/8" insulated copper pipe combines high-purity copper tubing with factory-applied insulation to help maintain stable refrigerant temperature and reduce energy loss.
The two tubes are tied together with insulating tape for neat transportation and installation. This structure supports clean handling, compact packaging and efficient routing during mini split AC installation.
Key Features of 1/4" x 3/8" x 50 ft Insulated Copper Pipe
50 ft insulated copper pipe for mini split, ductless AC and HVAC refrigerant line installation.
1/4" liquid line and 3/8" suction line for compatible HVAC systems.
99.9% pure copper tubing supports stable refrigerant flow and long service life.
Factory-applied insulation helps reduce heat gain, heat loss and condensation.
Black rubber insulation provides moisture resistance and thermal protection.
Plastic caps help protect copper pipe ends during storage and transportation.
Suitable for R410A, R32 and similar HVAC refrigerants when installed correctly.
Designed for residential and light commercial HVAC installations.
OEM length, insulation thickness, logo printing and packaging customization are available.
Standard Line Sizes for HVAC Compatibility
1/4" Liquid Line
The 1/4" copper tube is commonly used as the liquid line in compatible mini split and ductless HVAC systems.
3/8" Suction Line
The 3/8" copper tube is commonly used as the suction line, helping return refrigerant vapor from the indoor unit to the outdoor compressor.
Common HVAC Capacity Range
The 1/4" x 3/8" line set 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 HVAC equipment manufacturer’s installation manual.
Factory-Applied Insulation for Enhanced Performance
Improved Energy Efficiency
Pre-insulated tubing helps reduce thermal transfer during refrigerant flow, keeping refrigerant at a more stable temperature and supporting HVAC system efficiency.
Condensation Control
The insulation surface reduces condensation and dripping, helping prevent moisture damage to walls, ceilings and surrounding building materials.
UV-Resistant and Weather-Ready Design
The insulation is designed for indoor and outdoor line runs, helping protect the copper pipe from sunlight, weather exposure and installation wear.
99.9% Pure Copper for Reliable HVAC Performance
Made from 99.9% pure copper tubing, this insulated copper pipe provides excellent thermal conductivity, corrosion resistance and reliable performance under common HVAC operating conditions.
High-quality copper construction helps maintain stable refrigerant circulation and supports long-term mini split and ductless HVAC system operation.
99.9% Pure Copper
Black Rubber Insulated Pipe
Plastic Cap Protection
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 moisture-proof layer.
No additional water vapor permeation protective layer is required in many standard installations.
Helps protect copper pipe from thermal loss, moisture, abrasion and outdoor exposure.
Compatibility and HVAC Applications
Mini split air conditioners.
Ductless heat pump systems.
Residential HVAC setups.
Light commercial HVAC installations.
Replacement refrigerant line projects.
Indoor and outdoor HVAC line runs.
This 50 ft insulated copper pipe is compatible with common HVAC refrigerants such as R410A, R32 and similar refrigerants when the system pressure rating, line size and installation method match equipment requirements.
Technical Specifications
| Specification | Detail |
| Product Name | 1/4" x 3/8" x 50 ft Insulated Copper Pipe |
| Length | 50 ft / approx. 15.24 m |
| Line Size | 1/4" x 3/8" |
| Metric Size | 6.35 mm x 9.52 mm |
| Common Function | 1/4" liquid line and 3/8" suction line |
| Material | 99.9% pure copper tubing |
| Insulation | Factory-applied black rubber insulation |
| Temperature Range | -40℃ to 120℃ insulation operating range |
| Application | Mini split HVAC refrigerant line, ductless AC and heat pump systems |
| Customization | Length, insulation thickness, logo printing and export packaging available |
Installation Tips for Best Results
Confirm Refrigerant Line Path Before Installation
Measure the total line run between indoor and outdoor units before installation to confirm the 50 ft length is suitable.
Avoid Sharp Bends and Kinks
Route the copper lines with smooth bends to maintain refrigerant flow and avoid damaging the tubing or insulation.
Protect Insulated Lines at Wall Penetrations
Use wall sleeves, grommets or line set covers where the insulated lines pass through building surfaces to protect insulation and tubing from abrasion.
Support Line Set Properly
Secure copper lines with appropriate clamps, straps or brackets to minimize vibration, prevent sagging and extend line set service life.
Insulated Copper Pipe Size Options
| Size | Length | Insulation Black Rubber | Flame Resistant |
| 1/4 + 3/8 | 15 m / 20 m / 25 m / 30 m / 50 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 1/4 + 1/2 | 15 m / 20 m / 25 m / 30 m / 50 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 1/4 + 5/8 | 15 m / 20 m / 25 m / 30 m / 50 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 3/8 + 5/8 | 15 m / 20 m / 25 m / 30 m / 50 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 3/8 + 3/4 | 15 m / 20 m / 25 m / 30 m / 50 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 1/2 + 3/4 | 15 m / 20 m / 25 m / 30 m / 50 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 3/8 + 7/8 | 15 m / 20 m / 25 m / 30 m / 50 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 pipe 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 line sizing should always follow the HVAC equipment manufacturer’s installation manual.
Why Choose This 50 ft Insulated Copper Pipe?
Reliable Performance and Installation Ease
With premium copper construction and factory-insulated design, this 50 ft line set delivers dependable HVAC performance, easier installation and long-lasting durability.
Suitable for Residential and Light Commercial Systems
The 50 ft length gives installers flexibility for homes, apartments, offices and retrofit projects where a longer line route is required.
OEM and Bulk Supply Available
Dabund supports customized line length, insulation thickness, printed company name, size marking, logo printing and export packaging for distributors and private-label HVAC brands.
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 pipe products to customers face to face.
FAQ
What is 1/4" x 3/8" x 50 ft insulated copper pipe used for?
It is used as a pre-insulated refrigerant line set for mini split air conditioners, ductless AC systems, heat pumps and HVAC installations.
What does 1/4" x 3/8" mean in this insulated copper pipe set?
It refers to the outer diameters of the two copper tubes: 1/4" for the liquid line and 3/8" for the suction line.
Is this insulated copper pipe suitable for mini split systems?
Yes. It is commonly used for compatible mini split and ductless HVAC systems when the equipment requires 1/4" x 3/8" refrigerant lines.
Is this insulated copper pipe suitable for outdoor use?
Yes. The factory-applied insulation is UV-resistant and weather-ready for many outdoor HVAC line runs when installed correctly.
Do I need extra insulation in the field?
In most standard installations, no extra insulation is needed because this product comes with factory-applied insulation. Local codes or harsh environments may require additional protection.
Is this line set compatible with R410A and R32 refrigerants?
Yes. It can be compatible with common refrigerants such as R410A, R32 and similar HVAC refrigerants when the pipe specification and installation match system requirements.
Can the 50 ft insulated copper pipe be cut shorter?
Yes. Copper line sets can be cut to the required length. Proper cutting, deburring, flaring, torque control, evacuation and leak testing are required.
What AC capacity is 1/4" x 3/8" commonly used for?
The 1/4" x 3/8" line set is commonly used for 0.75 ton to 1.0 ton mini split systems and many 9,000 BTU to 12,000 BTU applications.
Can Dabund customize insulated copper pipe products?
Yes. Dabund can customize line length, insulation thickness, insulation material, logo printing, product marking and export packaging for OEM and wholesale buyers.
Are you a trading company or manufacturer?
Dabund is a manufacturer of insulated copper pipe, mini split line sets, aluminum pipe and HVAC installation 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.
