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DBJ-003
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DABUND
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Copper
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1M - 50M
Material
Color
Keywords
Application
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MOQ
Package
1/4 in. x 3/8 in. Pre-Insulated Mini Split Refrigerant Line Set
DABUND 1/4 in. x 3/8 in. Mini Split Refrigerant Line Set combines two copper refrigerant tubes with factory-applied insulation for compatible ductless mini split, heat-pump and HVAC installations.
The line set includes a 1/4 in. liquid line and 3/8 in. suction line. The tubing is manufactured from 99.9% pure copper and supplied with pre-installed insulation to help reduce heat transfer, control condensation and simplify field installation.
White PE insulated configurations are available for indoor and outdoor HVAC piping applications, with multiple insulation thicknesses and production lengths available for different project requirements.
Quick Answer: This 1/4 x 3/8 mini split line set uses 99.9% pure copper with factory-applied insulation for compatible ductless AC and heat-pump refrigerant piping.
1/4 x 3/8 Refrigerant Line Set Specifications
| Product Type | Pre-Insulated Mini Split Refrigerant Line Set |
| Line Set Size | 1/4 in. x 3/8 in. |
| Liquid Line | 1/4 in. |
| Suction Line | 3/8 in. |
| Copper Material | 99.9% Pure Copper |
| Insulation | Factory-applied insulation; White PE configuration available |
| Insulation Feature | UV-resistant configuration for compatible indoor and outdoor applications |
| Available Production Lengths | 15 m / 20 m / 25 m / 30 m / 50 m |
| Applications | Compatible mini split, ductless AC and heat-pump systems |
Mini Split Refrigerant Line Set Video
Key Features of the 1/4 x 3/8 Mini Split Line Set
1/4 in. liquid line and 3/8 in. suction line.
99.9% pure copper refrigerant tubing.
Factory-applied insulation reduces additional field insulation work.
White PE insulated configurations available.
UV-resistant insulation options for compatible outdoor exposure.
Multiple production lengths and insulation thicknesses available.
Suitable for compatible ductless mini split, heat-pump and HVAC installations.
99.9% Pure Copper Refrigerant Tubing
The refrigerant line set uses 99.9% pure copper tubing for refrigerant transfer between compatible indoor evaporator and outdoor condenser units.
Copper tubing provides the flexibility required for HVAC line routing while supporting reliable refrigerant piping installation.
Always confirm that the HVAC equipment manufacturer specifies a 1/4 in. liquid line and 3/8 in. suction line before selecting this product.
Factory-Applied Pipe Insulation
Factory-applied insulation helps limit heat gain and heat loss around the refrigerant tubing and helps control surface condensation during HVAC operation.
Pre-insulated tubing also reduces the amount of insulation wrapping required during field installation.
Copper Line Set and Insulation Video
99.9% Pure Copper
White PE Insulation
Protective Plastic Cap
White PE Insulation
White PE insulated configurations are available for DABUND mini split refrigerant line sets.
The insulation is designed to help reduce thermal transfer and condensation while providing additional protection around the copper tubing.
Insulation Production
Insulation Pipe Production
Insulation Pipe Warehouse
Inner Insulation Layer
Mini Split Refrigerant Line Set
The 1/4 in. x 3/8 in. line set is designed for compatible mini split and ductless HVAC systems requiring this specific refrigerant tubing combination.
Available Refrigerant Line Set Sizes
| Line Set Size | Available Lengths | White PE Insulation | Listed Flame-Resistance Options |
|---|---|---|---|
| 1/4 + 3/8 in. | 15 m / 20 m / 25 m / 30 m / 50 m | 8 / 9 / 10 / 13 / 19 / 25.4 mm | M1 / B1 |
| 1/4 + 1/2 in. | 15 m / 20 m / 25 m / 30 m / 50 m | 8 / 9 / 10 / 13 / 19 / 25.4 mm | M1 / B1 |
| 1/4 + 5/8 in. | 15 m / 20 m / 25 m / 30 m / 50 m | 8 / 9 / 10 / 13 / 19 / 25.4 mm | M1 / B1 |
| 3/8 + 5/8 in. | 15 m / 20 m / 25 m / 30 m / 50 m | 8 / 9 / 10 / 13 / 19 / 25.4 mm | M1 / B1 |
| 3/8 + 3/4 in. | 15 m / 20 m / 25 m / 30 m / 50 m | 8 / 9 / 10 / 13 / 19 / 25.4 mm | M1 / B1 |
| 1/2 + 3/4 in. | 15 m / 20 m / 25 m / 30 m / 50 m | 8 / 9 / 10 / 13 / 19 / 25.4 mm | M1 / B1 |
| 3/8 + 7/8 in. | 15 m / 20 m / 25 m / 30 m / 50 m | 8 / 9 / 10 / 13 / 19 / 25.4 mm | M1 / B1 |
General Line Set Size and Capacity Reference
The following capacity ranges are general references from the DABUND refrigerant line set family. Final tube sizing must always follow the HVAC equipment manufacturer's specified refrigerant-line dimensions.
| Line Set Size | General Ton Reference | General BTU Reference |
|---|---|---|
| 1/4 + 3/8 in. | 0.75–1.0 Ton | 9,000 / 12,000 BTU |
| 1/4 + 1/2 in. | 1.5–2.0 Ton | 12,000 / 18,000 BTU |
| 1/4 + 5/8 in. | 2.0–2.5 Ton | 24,000 / 30,000 BTU |
| 3/8 + 5/8 in. | 3.0–4.0 Ton | 36,000 / 48,000 BTU |
| 3/8 + 3/4 in. | 4.5–6.0 Ton | 54,000 / 72,000 BTU |
| 3/8 + 7/8 in. | 6.0–8.0 Ton | 72,000–96,000 BTU |
HVAC Applications
Ductless mini split air conditioners
Ductless heat-pump systems
Residential HVAC installations
Apartment air-conditioning systems
Office HVAC systems
Compatible light commercial applications
Refrigerant Compatibility
The product information lists use with common HVAC refrigerants including R410A and R32.
Refrigerant compatibility, allowable system pressure, required copper tube sizes and maximum line length must be confirmed against the specific HVAC equipment manufacturer's technical specifications.
How to Select the Correct Refrigerant Line Set
Confirm the Required Liquid Line Size
Confirm that the air-conditioning or heat-pump equipment requires a 1/4 in. liquid line.
Confirm the Required Suction Line Size
Confirm that the equipment requires a 3/8 in. suction line. Both tube dimensions must match the equipment manufacturer's specifications.
Confirm the Required Line Length
Measure the complete refrigerant piping route and select an appropriate production length. Available listed lengths include 15 m, 20 m, 25 m, 30 m and 50 m.
Check Equipment Line-Length Limits
Verify the HVAC manufacturer's maximum permitted refrigerant piping length and elevation difference before installation.
Select the Required Insulation Thickness
Listed White PE insulation thickness options include 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm.
Installation Considerations
Plan the complete refrigerant piping route before installation to reduce unnecessary bends, kinks and mechanical stress on the copper tubing.
Long or exposed refrigerant lines should be supported with suitable clamps or straps to reduce sagging, vibration and damage to the insulation.
Always follow the HVAC equipment manufacturer's instructions for refrigerant piping length, elevation, flare connections, evacuation and system commissioning.
DABUND Mini Split Line Set Factory
DABUND manufactures insulated copper pipe, mini split refrigerant line sets, aluminum pipe and related HVAC installation products.
Insulation Test Documentation
DABUND maintains test documentation for applicable insulation configurations, with references including ASTM E84, UL94, ASTM D1056 and ASTM G21.
Insulation materials vary by configuration. Buyers requiring specific certification should confirm the actual insulation material, thickness and corresponding test documentation before ordering.
International HVAC Exhibitions
DABUND participates in international HVAC exhibitions where distributors and professional buyers can review mini split refrigerant line sets and related HVAC installation products.
Frequently Asked Questions
What does 1/4 in. x 3/8 in. mean?
It refers to the listed outside diameters of the two refrigerant tubes: 1/4 in. for the liquid line and 3/8 in. for the suction line.
What material is the refrigerant tubing made from?
The product information lists 99.9% pure copper tubing.
Is this mini split line set pre-insulated?
Yes. The copper refrigerant tubing is supplied with factory-applied insulation.
What insulation configuration is shown?
The featured product images show a White PE insulated configuration.
What insulation thicknesses are available?
Listed White PE insulation thicknesses include 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm.
What production lengths are available?
Listed production lengths include 15 m, 20 m, 25 m, 30 m and 50 m.
What size air conditioner can use a 1/4 x 3/8 line set?
The product family lists 1/4 in. x 3/8 in. as a general reference for some 0.75–1.0 ton or 9,000–12,000 BTU systems. Final refrigerant-line sizing must follow the equipment manufacturer's specifications.
Is this line set compatible with every mini split brand?
No universal compatibility should be assumed. Check the required liquid-line size, suction-line size, connection type and maximum permitted piping length for the specific HVAC equipment.
Is this line set listed for R410A and R32?
The product information lists use with common refrigerants including R410A and R32. Final suitability should be confirmed against the HVAC equipment manufacturer's specifications.
Can this line set be used outdoors?
UV-resistant insulation configurations are available for compatible outdoor installations. Confirm the required insulation specification for the project environment.
Is additional field insulation required?
Factory-applied insulation reduces the need for additional field wrapping, although local codes and specific installation conditions may require additional protection.
What other line set sizes are available?
Available combinations include 1/4 + 3/8, 1/4 + 1/2, 1/4 + 5/8, 3/8 + 5/8, 3/8 + 3/4, 1/2 + 3/4 and 3/8 + 7/8 in.
Can DABUND provide free samples?
Yes. The listed sample policy provides up to three free samples for qualified requests, with the buyer paying the express freight. View Sample Information
What payment terms are available?
Available payment methods include T/T, L/C at sight and credit card.
What delivery terms are available?
Available delivery terms include EXW, FOB, CFR and CIF.
Does DABUND support OEM and ODM?
Yes. OEM and ODM services, including logo customization, are available for suitable orders.
What is the typical delivery time?
The listed typical delivery time is approximately 15–20 days, depending on order quantity and production requirements.
