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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" Mini Split Installation Kit
The Dabund 25 ft 1/4" x 3/8" mini split installation kit combines a pre-insulated copper refrigerant line set with the accessories required for compatible ductless air conditioner and heat-pump installations. The standard configuration includes a 1/4" liquid line, a 3/8" suction line, factory-flared ends, flare nuts, communication cable, condensate drain hose, wall sleeve, decorative wall cap, wrapping tape, and selected installation accessories.
This 25 ft HVAC installation kit is designed for contractors, mini split distributors, wholesalers, importers, equipment brands, and project buyers that need a standardized line set and accessory package. Copper tube size, insulation thickness, cable specification, accessory quantities, packaging, and printed branding can be customized for OEM and private-label orders.
Compatibility notice: Confirm that the exact indoor and outdoor units require 1/4" liquid and 3/8" suction connections and permit a 25 ft refrigerant run. Nominal BTU capacity alone is not sufficient for selecting a line set. Always follow the equipment manufacturer’s piping, refrigerant-charge, flare-torque, electrical, and installation requirements.
Product Specifications
| Product Name | 25 Ft 1/4" x 3/8" Mini Split Installation Kit |
| Nominal Length | 25 ft / approximately 7.62 m |
| Liquid Line Outside Diameter | 1/4" / 6.35 mm |
| Suction Line Outside Diameter | 3/8" / 9.52 mm |
| Copper Material | C12200 DHP copper; ASTM B280 configurations available |
| Tube Ends | Factory-flared ends with matching flare nuts |
| Standard Insulation | White closed-cell PE insulation with embossed protective outer film |
| Insulation Thickness Options | 8 mm, 9 mm, 10 mm, 13 mm, 19 mm, or 25.4 mm |
| Insulation Temperature Range | Approximately -40°C to 120°C, subject to the selected insulation specification |
| Applications | Compatible ductless mini split, heat-pump, multi-split, and split HVAC systems specifying 1/4" x 3/8" refrigerant connections |
| Customization | Length, tube size, copper wall thickness, insulation, cable, drain hose, accessories, carton, logo, and private label |
What Is Included in the Installation Kit?
The standard package can be configured with the components below. Final contents should be confirmed in the quotation because cable size, drain hose length, wall sleeve dimensions, accessory quantities, and insulation thickness may vary by market or customer requirement.
One 25 ft pre-insulated 1/4" copper liquid line
One 25 ft pre-insulated 3/8" copper suction line
Factory-flared tube ends and matching flare nuts
Communication or interconnecting wire cable
Condensate drain hose
Wall sleeve and decorative wall cap
Wrapping tape and selected installation accessories
Ordering note: This is a conventional flared copper installation kit, not a universal pre-charged quick-connect line set. Confirm whether the connected equipment requires standard flare connections, proprietary connectors, a specific wire gauge, or additional fittings.
Key Features of the 25 Ft Mini Split Line Set
Refrigeration-Grade Copper Tubing
The refrigerant lines can be manufactured from C12200 deoxidized high-phosphorus copper for air-conditioning and refrigeration service. ASTM B280 configurations are available according to tube diameter, wall thickness, refrigerant pressure, destination standard, and project requirements.
Factory-Flared Ends with Matching Nuts
Both copper tubes can be supplied with factory-prepared flare ends and matching nuts to reduce field preparation. Every flare should still be inspected before installation and tightened with the torque specified by the equipment manufacturer.
Closed-Cell Insulation for Condensation Control
The pre-applied closed-cell insulation helps reduce heat transfer and surface condensation around the refrigerant tubing. Available insulation thicknesses support different ambient temperatures, humidity levels, project specifications, and regional requirements.
Complete Accessory Package
Combining the copper line set, cable, drain hose, wall sleeve, decorative cap, and installation accessories in one package helps distributors and contractors standardize purchasing and reduce missing components at the job site.
OEM and Private-Label Supply
Dabund can customize insulation printing, cable specifications, drain hose, accessory combinations, labels, cartons, barcodes, instructions, cap colors, and logos for wholesalers, HVAC distributors, importers, and equipment brands.
99.9% Pure Copper
White PE Insulation
Flared Ends and Nuts
Three-Layer Insulation Structure
The insulated copper tubing can use an embossed polyethylene outer film, a dense closed-cell foam core, and an inner insulation layer fitted around the copper tube. This structure is designed to improve thermal performance, moisture resistance, abrasion protection, and handling durability.
Insulation Production
Stable Inventory Supply
Closed-Cell Inner Layer
Outer Protective Film
The embossed outer film helps protect the insulation against abrasion, handling damage, aging, and weather exposure. UV-resistant options are available for projects where sections of the line set may be installed outdoors.
Closed-Cell Foam Core
The dense foam core helps limit heat transfer, condensation, moisture penetration, and impact during installation. Foam density and thickness can be selected according to the project environment and required performance.
Inner Insulation Layer
The inner layer surrounds the copper tube and helps maintain insulation continuity. All cut ends, flare joints, valves, and damaged sections should be resealed with compatible insulation and vapor-resistant tape after installation.
Product and Accessory Overview
The 25 ft installation kit can be supplied as a complete contractor package or configured for retail, distributor, OEM, and private-label programs. Buyers should confirm whether the order includes only the insulated copper line set or the full cable, drain hose, sleeve, wall cap, tape, and accessory package.
Available Mini Split Line Set Sizes
Dabund supplies multiple liquid-line and suction-line combinations for residential and commercial HVAC applications. Standard lengths include 3 m, 4 m, 5 m, 7 m, and 10 m, with additional imperial and metric lengths available by request.
| Copper Tube Pair | Available Lengths | White PE Insulation | Flame-Resistance Options |
|---|---|---|---|
| 1/4" + 3/8" | 3 m / 4 m / 5 m / 7 m / 10 m | 8 / 9 / 10 / 13 / 19 / 25.4 mm | M1 / B1 options |
| 1/4" + 1/2" | 3 m / 4 m / 5 m / 7 m / 10 m | 8 / 9 / 10 / 13 / 19 / 25.4 mm | M1 / B1 options |
| 1/4" + 5/8" | 3 m / 4 m / 5 m / 7 m / 10 m | 8 / 9 / 10 / 13 / 19 / 25.4 mm | M1 / B1 options |
| 3/8" + 5/8" | 3 m / 4 m / 5 m / 7 m / 10 m | 8 / 9 / 10 / 13 / 19 / 25.4 mm | M1 / B1 options |
| 3/8" + 3/4" | 3 m / 4 m / 5 m / 7 m / 10 m | 8 / 9 / 10 / 13 / 19 / 25.4 mm | M1 / B1 options |
| 1/2" + 3/4" | 3 m / 4 m / 5 m / 7 m / 10 m | 8 / 9 / 10 / 13 / 19 / 25.4 mm | M1 / B1 options |
| 3/8" + 7/8" | 3 m / 4 m / 5 m / 7 m / 10 m | 8 / 9 / 10 / 13 / 19 / 25.4 mm | M1 / B1 options |
How to Confirm Mini Split Compatibility
A 1/4" x 3/8" line set is used by selected ductless mini split and heat-pump models, but compatibility is model-specific. Systems with similar nominal capacities can require different refrigerant-line diameters, copper wall thicknesses, flare sizes, maximum piping lengths, or additional refrigerant charges.
| Item to Verify | Required Check |
|---|---|
| Tube Diameter | The equipment manual must specify a 1/4" liquid line and 3/8" suction line. |
| Approved Length | Confirm that a 25 ft one-way run is within the permitted minimum and maximum piping range. |
| Refrigerant Charge | Check whether the factory charge covers 25 ft or whether an additional measured charge is required. |
| Flare Connections | Verify flare geometry, flare-nut size, connection material, and tightening torque. |
| Copper Specification | Match tube wall thickness and pressure capability to the refrigerant and system design pressure. |
| Electrical Cable | Confirm conductor count, wire gauge, insulation rating, voltage, and local electrical requirements. |
| Drainage | Verify drain hose diameter, gravity slope, route, termination, and condensate-pump requirements. |
Applications
The 25 ft installation kit can be used for compatible residential and light-commercial HVAC projects, including homes, apartments, offices, shops, equipment rooms, retrofit projects, replacement installations, and selected multi-split systems.
Ductless mini split air conditioners
Mini split heat pumps
Single-zone and selected multi-zone systems
Residential replacement and retrofit projects
Light-commercial climate-control installations
The exact equipment model and installation manual determine compatibility. Do not describe the kit as universally compatible with every mini split brand or capacity.
Installation Recommendations
Installation should be completed by a qualified HVAC technician in accordance with the equipment manual and local refrigerant, electrical, and building requirements. Keep the tube ends sealed until connection, avoid sharp bends and kinks, inspect the flare surfaces, use the specified torque, pressure-test the circuit, check for leaks, evacuate the piping, and commission the system according to the equipment manufacturer’s instructions.
Confirm the approved pipe sizes and 25 ft route before beginning installation.
Route the tubing with a suitable bend radius and protect it from crushing or kinking.
Inspect and align the factory flares before tightening the connections.
Seal insulation joints, wall penetrations, valves, and exposed copper completely.
Maintain the required drain-hose slope and prevent traps or restrictions unless specified.
Verify whether the system requires additional refrigerant for a 25 ft line length.
The suction line is a refrigerant pipe, not a condensate drain. Drainage slope requirements apply to the condensate hose; refrigerant-line routing must follow the equipment manufacturer’s piping instructions.
Quality and Test Documentation
Depending on the selected copper and insulation configuration, test documentation may be available for ASTM B280, C12200 copper, ASTM E84, UL 94, ASTM D1056, ASTM G21, flame spread, smoke development, thermal performance, and material properties. Request the current report that corresponds to the exact copper wall thickness, insulation material, insulation thickness, and production configuration being ordered.
Why Source Mini Split Installation Kits from Dabund?
Dabund has manufactured insulated copper pipe, mini split line sets, aluminum pipe, and HVAC installation accessories since 2008. The company supports contractors, HVAC distributors, wholesalers, importers, equipment brands, and project buyers with standard products and customized OEM configurations.
Multiple copper tube diameters and paired line-set configurations
Multiple imperial and metric lengths
White PE and black rubber insulation options
Factory flaring and matching flare nuts
Customized cable, drain hose, sleeve, cap, tape, and accessories
OEM labels, cartons, barcodes, instructions, logos, and private-label packaging
Dabund Factory
Production of insulated copper tubing, mini split line sets, aluminum pipe, and HVAC installation accessories.
Certificate and Test Support
Request certificates and test reports that match the copper tube, insulation grade, thickness, color, and production batch specified in the purchase order.
International HVAC Exhibitions
Dabund presents mini split line sets and HVAC accessories to international distributors, contractors, importers, and project buyers at industry trade shows.
Wholesale, OEM, and Custom Quotations
For an accurate quotation, provide the required tube diameters, finished length, copper wall thickness, insulation type and thickness, refrigerant type, cable specification, drain hose length, wall sleeve dimensions, included accessories, packaging method, destination market, order quantity, and certification requirements.
Private-label services can include insulation printing, customized cartons, product labels, barcodes, instruction sheets, logos, accessory combinations, and market-specific packaging. Sample availability and production lead time depend on specification, quantity, raw-material availability, and the confirmed factory schedule.
Frequently Asked Questions
What is included in the 25 ft 1/4" x 3/8" mini split installation kit?
The standard kit can include a 25 ft 1/4" liquid line, a 25 ft 3/8" suction line, closed-cell insulation, factory-flared ends, flare nuts, communication cable, drain hose, wall sleeve, decorative wall cap, wrapping tape, and selected installation accessories. Confirm the final packing list in the quotation.
Will a 1/4" x 3/8" line set fit my mini split system?
It will fit only equipment that specifies 1/4" liquid and 3/8" suction connections and permits a 25 ft line length. Check the exact indoor-unit and outdoor-unit installation manuals before ordering.
Is this kit compatible with every mini split brand?
No. Compatibility depends on pipe size, flare connection, copper wall thickness, refrigerant, permitted line length, electrical cable, and the exact equipment model. Do not rely on a universal-compatibility claim.
Is 1/4" x 3/8" always used for 9,000 or 12,000 BTU systems?
No. Many systems in those capacity ranges use 1/4" x 3/8" tubing, but other models specify different diameters. Select the line set from the equipment manufacturer’s piping table, not from nominal BTU capacity alone.
Are the copper tube ends pre-flared?
Yes. The standard kit can be supplied with factory-flared ends and matching flare nuts. The installer should inspect each flare, align the joint correctly, and use the manufacturer-specified tightening torque.
Is the line set pre-charged with refrigerant?
The standard product is a conventional insulated copper line set with flared ends, not a universal pre-charged quick-connect assembly. The installed refrigerant circuit normally requires leak testing, evacuation, and commissioning according to the equipment manual.
Does a 25 ft line set require additional refrigerant?
That depends on the equipment’s factory pre-charge allowance. Some systems include sufficient refrigerant for a defined line length, while others require an additional measured charge. Use only the formula specified for the exact equipment model.
Can the 25 ft line set be shortened?
It can be cut and re-flared by a qualified technician when the equipment manufacturer permits a shorter run. The finished length must remain within the approved piping range, and the new flares must be prepared and tested correctly.
Does the kit require additional pipe insulation?
The copper tubes are supplied with insulation, but joints, flare connections, valves, cut ends, damaged sections, and exposed accessories may require additional compatible insulation and vapor sealing. Outdoor sections may also require a weather-resistant jacket or line-set cover.
Can the cable and accessories be customized?
Yes. Cable conductor count, wire gauge, drain hose, wall sleeve, wall cap, tape, accessories, insulation, labels, cartons, barcodes, instructions, and logos can be customized for OEM and private-label orders.
Can I request a sample before placing a wholesale order?
Qualified buyers can request samples to evaluate copper dimensions, flaring, insulation, cable, accessories, printing, and packaging. Sample quantity, availability, and freight terms should be confirmed with the sales team.
What are the available payment, delivery, and lead-time terms?
Payment methods may include T/T, letter of credit at sight, and other agreed options. Trade terms may include EXW, FOB, CFR, or CIF. Production time depends on specification, order quantity, packaging, material availability, and the confirmed factory schedule.
