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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 1/2" Insulated Copper Tube
The Dabund 25 ft 1/4" x 1/2" insulated copper tube set is designed for compatible ductless mini split air conditioners, heat pumps, and split HVAC systems. It combines a 1/4" liquid line and a 1/2" suction line with black closed-cell rubber insulation to help reduce heat transfer, control condensation, and protect the refrigerant piping during installation and operation.
The standard configuration can be supplied with factory-flared tube ends and matching flare nuts. Depending on the order specification, the package can also include communication cable, condensate drain hose, wall sleeve, decorative wall cap, wrapping tape, and other installation accessories for HVAC contractors, distributors, wholesalers, importers, and private-label brands.
Compatibility notice: Confirm that the indoor and outdoor units require 1/4" liquid and 1/2" suction connections and permit a 25 ft refrigerant run. Pipe size, approved length, refrigerant charge, insulation thickness, electrical cable, and connection method must follow the equipment manufacturer’s installation manual.
Product Specifications
| Product Name | 25 Ft 1/4" x 1/2" Insulated Copper Tube Set |
| Nominal Length | 25 ft / approximately 7.62 m |
| Liquid Line Outside Diameter | 1/4" / 6.35 mm |
| Suction Line Outside Diameter | 1/2" / 12.70 mm |
| Copper Material | C12200 DHP copper; ASTM B280 configurations available |
| Tube Ends | Factory-flared ends with matching flare nuts |
| Standard Insulation | Black closed-cell rubber insulation |
| Standard Insulation Thickness | 1/2" / approximately 13 mm; other thicknesses available |
| Insulation Temperature Range | Approximately -40°C to 120°C, subject to the selected insulation grade |
| Applications | Compatible mini split, heat-pump, VRF, and split HVAC systems specifying 1/4" x 1/2" refrigerant connections |
| Customization | Length, tube size, wall thickness, insulation, cable, accessories, packaging, logo, and private label |
What Is Included?
The exact package can be configured for different markets and customers. A standard 25 ft insulated copper tube kit can include the following components:
One 25 ft 1/4" insulated copper liquid line
One 25 ft 1/2" insulated copper suction line
Factory-flared 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: Confirm the final packing list, wire specification, drain hose length, insulation thickness, flare-nut size, carton design, and labeling requirements in the quotation.
Key Features of the 25 Ft Insulated Copper Tube
Refrigeration-Grade Copper Tubing
The copper tubing can be manufactured from C12200 deoxidized high-phosphorus copper for air-conditioning and refrigeration applications. ASTM B280 configurations are available according to the required tube diameter, wall thickness, refrigerant pressure, destination standard, and project specification.
Pre-Flared Ends and Flare Nuts
Both copper tubes can be supplied with factory-prepared flare ends and matching nuts to reduce field preparation. Before connection, the installer should inspect the flare surface, align the joint correctly, and tighten it to the torque specified by the HVAC equipment manufacturer.
Black Closed-Cell Rubber Insulation
The flexible black rubber insulation has a closed-cell structure that helps reduce heat transfer and moisture vapor penetration. It is designed to limit condensation on cold refrigerant piping while providing flexibility around bends and equipment connections.
25 Ft Length for Common Installation Routes
The 25 ft length provides additional routing flexibility when the indoor and outdoor units cannot be positioned close together. Confirm the equipment’s minimum and maximum line-length requirements and determine whether additional refrigerant is required beyond the factory pre-charge allowance.
OEM and Private-Label Supply
Dabund can customize insulation printing, cable configuration, accessories, labels, cartons, barcodes, instruction sheets, cap colors, and logo placement for HVAC distributors, wholesalers, importers, equipment brands, and project buyers.
99.9% Pure Copper
Black Rubber Insulation
Factory Flaring
Black Rubber Pipe Insulation
Black rubber insulation is suitable for refrigerant lines that require flexible, closed-cell thermal insulation. The insulation layer also functions as a vapor-control layer, helping reduce moisture movement toward the cold copper surface when joints and cut ends are sealed correctly.
Thermal Insulation
The low-conductivity closed-cell structure helps reduce unwanted heat gain or heat loss through the refrigerant tubing. Correct insulation thickness should be selected according to suction-line temperature, ambient conditions, humidity, and local energy requirements.
Condensation and Moisture Control
Closed-cell rubber insulation helps limit water vapor penetration and surface condensation. All longitudinal seams, butt joints, fittings, flare connections, and damaged areas should be sealed with compatible adhesive, insulation tape, or vapor-resistant material.
Flexible Installation
The flexible insulation can follow gradual pipe bends and supports neat routing through wall penetrations, line-set covers, equipment spaces, and service areas. The copper tube must still be bent within the permitted radius to prevent flattening, kinking, or cracking.
Indoor and Protected Outdoor Applications
For outdoor installation, select an insulation grade with appropriate UV and weather resistance or install a compatible protective jacket or line-set cover. Exposed ends and joints require complete sealing to prevent water entry and insulation deterioration.
Product and Accessory Overview
The product can be supplied as an insulated copper tube pair or configured as a more complete mini split installation kit. Buyers should specify whether they require only the line set or a kit containing communication wire, drain hose, wall sleeve, decorative cap, wrapping tape, and installation accessories.
Available Insulated Copper Tube Sizes
Dabund supplies multiple liquid-line and suction-line combinations for residential and commercial HVAC applications. Standard short line-set lengths include 3 m, 4 m, 5 m, 7 m, and 10 m, with other imperial and metric lengths available by request.
| Copper Tube Pair | Available Lengths | Black Rubber Insulation | Flame-Resistance Options |
|---|---|---|---|
| 1/4" + 3/8" | 3 m / 4 m / 5 m / 7 m / 10 m | 13 / 17 / 19 / 25.4 mm options | M1 / B1 options |
| 1/4" + 1/2" | 3 m / 4 m / 5 m / 7 m / 10 m | 13 / 17 / 19 / 25.4 mm options | M1 / B1 options |
| 1/4" + 5/8" | 3 m / 4 m / 5 m / 7 m / 10 m | 13 / 17 / 19 / 25.4 mm options | M1 / B1 options |
| 3/8" + 5/8" | 3 m / 4 m / 5 m / 7 m / 10 m | 13 / 17 / 19 / 25.4 mm options | M1 / B1 options |
| 3/8" + 3/4" | 3 m / 4 m / 5 m / 7 m / 10 m | 13 / 17 / 19 / 25.4 mm options | M1 / B1 options |
| 1/2" + 3/4" | 3 m / 4 m / 5 m / 7 m / 10 m | 13 / 17 / 19 / 25.4 mm options | M1 / B1 options |
| 3/8" + 7/8" | 3 m / 4 m / 5 m / 7 m / 10 m | 13 / 17 / 19 / 25.4 mm options | M1 / B1 options |
How to Confirm System Compatibility
A 1/4" x 1/2" line set is commonly used by selected mini split and heat-pump models, but refrigerant pipe size cannot be selected reliably by BTU capacity or tonnage alone. Similar-capacity systems from different manufacturers may require different pipe diameters, wall thicknesses, flare sizes, or refrigerant charges.
| Item to Verify | Required Check |
|---|---|
| Tube Diameter | The equipment documentation must specify a 1/4" liquid line and 1/2" suction line. |
| Line Length | Confirm that 25 ft is within the approved minimum and maximum piping range. |
| Refrigerant Charge | Check whether the factory charge covers 25 ft or whether additional refrigerant must be weighed in. |
| Flare and Nut | Verify flare geometry, nut size, connection material, and tightening torque. |
| Copper Specification | Match tube wall thickness and pressure capability to the refrigerant and system design pressure. |
| Insulation | Confirm thickness, vapor sealing, fire-performance requirements, and outdoor protection. |
| Electrical Cable | Confirm conductor count, wire gauge, voltage rating, and local electrical-code requirements. |
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 copper tube ends sealed until connection, avoid sharp bends and kinks, inspect the flares, use the specified torque, pressure-test with dry nitrogen, check for leaks, evacuate the circuit, and charge the system according to the equipment manufacturer’s instructions.
Do not leave insulation joints, flare connections, or exposed copper unsealed. Protect outdoor sections from sunlight, rain, physical damage, birds, and rodents with a suitable jacket or line-set cover where required.
Quality and Test Documentation
Depending on the selected copper and insulation specification, test documentation may be available for ASTM B280, C12200 copper, ASTM E84, UL 94, ASTM D1056, ASTM G21, thermal performance, flame spread, smoke development, and material properties. Buyers should request the current document that corresponds to the exact tube wall thickness, insulation material, insulation thickness, and production configuration being ordered.
Why Source Insulated Copper Tubes 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, importers, equipment brands, and project buyers with standard products and customized OEM configurations.
Multiple copper tube diameters and paired line-set sizes
White PE and black rubber insulation options
Factory flaring and matching flare nuts
Customized cable, drain hose, sleeve, cap, and accessories
OEM insulation printing, labels, cartons, barcodes, and logos
Sample evaluation and bulk export-order support
Dabund Factory and Packaging
Production and export packaging for insulated copper tubing, mini split line sets, and HVAC installation accessories.
Certificate and Test Support
Request certificates and test reports that match the copper tube, insulation material, thickness, color, and production batch specified in the purchase order.
International HVAC Exhibitions
Dabund presents insulated copper tubing, mini split line sets, and HVAC accessories to international distributors, contractors, importers, and project buyers.
Wholesale, OEM, and Custom Quotations
For an accurate quotation, provide the required liquid-line and suction-line diameters, finished length, copper wall thickness, insulation material and thickness, refrigerant type, cable specification, drain hose length, included accessories, packaging, destination market, annual demand, and certification requirements.
Private-label services can include printed insulation, customized cartons, product labels, barcodes, logos, instruction sheets, accessory combinations, and market-specific packaging. Sample availability and production lead time depend on the requested specification, quantity, raw-material availability, and factory schedule.
Frequently Asked Questions
What is a 25 ft 1/4" x 1/2" insulated copper tube set?
It is a paired HVAC refrigerant line set containing a 25 ft 1/4" liquid tube and a 25 ft 1/2" suction tube. Both tubes are insulated, and the standard configuration can include flared ends and flare nuts.
Will a 1/4" x 1/2" line set fit my mini split?
It will fit only equipment that specifies 1/4" liquid and 1/2" suction connections and permits a 25 ft refrigerant run. Check the installation manual and service-valve sizes for the exact indoor and outdoor units.
Is 1/4" x 1/2" always used for 12,000 or 18,000 BTU systems?
No. Some systems in those capacity ranges use 1/4" x 1/2" tubing, but others specify different diameters. Nominal BTU capacity alone is not sufficient for selecting a refrigerant line set.
Are the copper tube ends pre-flared?
Yes. The standard 25 ft configuration can be supplied with factory-flared ends and matching flare nuts. The installer should inspect each flare and tighten the connection to the equipment manufacturer’s specified torque.
Is this line set pre-charged with refrigerant?
The standard product is insulated copper tubing with flared ends, not a universal pre-charged quick-connect line set. The installed refrigerant circuit normally requires leak testing, evacuation, and charging procedures specified by the equipment manufacturer.
Does a 25 ft line set require additional refrigerant?
That depends on the equipment’s factory pre-charge allowance. Some systems include sufficient charge for a defined line length, while others require an additional measured charge. Use only the formula in the model-specific installation manual.
What are the benefits of black rubber insulation?
Closed-cell rubber insulation is flexible and helps reduce heat transfer, moisture vapor movement, and surface condensation. Correct insulation thickness and complete sealing are necessary for effective performance.
Can the insulated copper tubing be installed outdoors?
Outdoor installation is possible when the insulation and protective system are suitable for UV, weather, moisture, and physical exposure. A line-set cover or weather-resistant jacket is recommended where required by the project specification.
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 equipment’s approved piping range.
Can Dabund customize the insulation and package?
Yes. Custom options include insulation type and thickness, printed markings, cable, drain hose, accessories, labels, cartons, barcodes, instructions, logos, and private-label packaging.
Can I request a sample before placing a wholesale order?
Qualified buyers can request samples to evaluate copper dimensions, flaring, insulation, accessories, printing, and packaging. Sample quantity, availability, and freight terms should be confirmed with the sales team.
What are the available payment, shipping, 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, quantity, packaging, material availability, and the confirmed factory schedule.
