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DURO LINE

DURO LINE is a brand specializing in insulated refrigerant line sets for HVAC and refrigeration applications. The product line consists of pre-assembled, factory-insulated copper or steel tubing pairs (liquid and suction lines) that are used to connect outdoor condensing units to indoor evaporator coils in split-system air conditioners and heat pumps. The brand is known for producing line sets that meet standard industry specifications for pressure ratings, insulation thickness, and material compatibility. DURO LINE line sets are constructed with either copper or steel tubing, with the steel variants typically used in applications where cost or mechanical strength is a consideration. The insulation is made from elastomeric material, which provides thermal efficiency and condensation control across a range of operating temperatures. All DURO LINE line sets feature black elastomeric insulation with a nominal thickness of 1/2 inch, which is a common specification for residential and light commercial systems. The liquid lines are available in diameters such as 1/4 inch and 3/8 inch, while the suction lines are sized accordingly to match standard system requirements. The line sets are supplied with plain ends (no pre-installed fittings) to allow field brazing or flaring, giving installers flexibility in connection methods. DURO LINE products are manufactured to consistent quality standards, with each line set pressure-tested and cleaned prior to insulation application. The brand does not claim proprietary technology or unique certifications beyond standard industry norms; its value proposition lies in offering a reliable, off-the-shelf solution for contractors and distributors who need predictable performance and easy ordering. 3G Electric stocks a range of DURO LINE insulated line sets in lengths from 15 to 50 feet, covering the most common configurations for split-system installations. The inventory includes both 1/4-inch and 3/8-inch liquid line sizes, paired with appropriate suction line diameters. Each SKU is backed by datasheets that specify dimensions, material grades, and handling guidelines. 3G Electric's logistics support ensures that these line sets are available for global shipment, with proper packaging to prevent damage during transit. For procurement specialists and maintenance managers, DURO LINE line sets represent a straightforward choice for new installations or replacement work where compatibility with standard R-410A and R-22 systems is required. The elastomeric insulation meets typical building codes for thermal resistance and vapor retardance, and the steel tubing options provide an alternative for projects where copper pricing or availability is a concern. 3G Electric does not modify or customize DURO LINE products; the brand's catalog is offered as-is, with the assurance that each unit matches the manufacturer's published specifications.

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About DURO LINE

DURO LINE is a brand specializing in insulated refrigerant line sets for HVAC and refrigeration applications. The product line consists of pre-assembled, factory-insulated copper or steel tubing pairs (liquid and suction lines) that are used to connect outdoor condensing units to indoor evaporator coils in split-system air conditioners and heat pumps. The brand is known for producing line sets that meet standard industry specifications for pressure ratings, insulation thickness, and material compatibility. DURO LINE line sets are constructed with either copper or steel tubing, with the steel variants typically used in applications where cost or mechanical strength is a consideration. The insulation is made from elastomeric material, which provides thermal efficiency and condensation control across a range of operating temperatures. All DURO LINE line sets feature black elastomeric insulation with a nominal thickness of 1/2 inch, which is a common specification for residential and light commercial systems. The liquid lines are available in diameters such as 1/4 inch and 3/8 inch, while the suction lines are sized accordingly to match standard system requirements. The line sets are supplied with plain ends (no pre-installed fittings) to allow field brazing or flaring, giving installers flexibility in connection methods. DURO LINE products are manufactured to consistent quality standards, with each line set pressure-tested and cleaned prior to insulation application. The brand does not claim proprietary technology or unique certifications beyond standard industry norms; its value proposition lies in offering a reliable, off-the-shelf solution for contractors and distributors who need predictable performance and easy ordering. 3G Electric stocks a range of DURO LINE insulated line sets in lengths from 15 to 50 feet, covering the most common configurations for split-system installations. The inventory includes both 1/4-inch and 3/8-inch liquid line sizes, paired with appropriate suction line diameters. Each SKU is backed by datasheets that specify dimensions, material grades, and handling guidelines. 3G Electric's logistics support ensures that these line sets are available for global shipment, with proper packaging to prevent damage during transit. For procurement specialists and maintenance managers, DURO LINE line sets represent a straightforward choice for new installations or replacement work where compatibility with standard R-410A and R-22 systems is required. The elastomeric insulation meets typical building codes for thermal resistance and vapor retardance, and the steel tubing options provide an alternative for projects where copper pricing or availability is a concern. 3G Electric does not modify or customize DURO LINE products; the brand's catalog is offered as-is, with the assurance that each unit matches the manufacturer's published specifications.

Common Applications

  • Residential split-system air conditioning — DURO LINE steel refrigerant line sets (e.g., SLS387825) for connecting outdoor condenser to indoor evaporator.
  • Light commercial heat pump installations — DURO LINE 50-ft line sets (e.g., SLS385850) for rooftop or ground-mounted units.
  • HVAC system retrofits in existing buildings — DURO LINE 25-ft line sets (e.g., SLS141250) for replacing old refrigerant lines.
  • New construction HVAC rough-in — DURO LINE 35-ft line sets (e.g., SLS387835) for pre-installing line sets before drywall.
  • Refrigeration system maintenance — DURO LINE 15-ft line sets (e.g., SLS141215) for short-run replacements in walk-in coolers.

Frequently asked questions

Common questions about DURO LINE from 3G Electric.

What materials are used in DURO LINE insulated line sets?

DURO LINE insulated line sets are available with either copper or steel tubing for the liquid and suction lines. The insulation is made from elastomeric material, which is a closed-cell foam that provides thermal insulation and condensation control. The insulation color is black, and the nominal thickness is 1/2 inch. The connection ends are plain (no fittings) and are made from the same material as the tubing—steel for steel line sets. The line sets are designed for field brazing or flaring.

What lengths and diameters are available for DURO LINE line sets from 3G Electric?

3G Electric stocks DURO LINE insulated line sets in lengths of 15, 25, 35, and 50 feet. The liquid line diameters available are 1/4 inch and 3/8 inch, with corresponding suction line sizes that match standard split-system configurations. For example, SKU 896CU5 is a 50-foot set with a 1/4-inch liquid line, while SKU 896CT7 is a 25-foot set with a 3/8-inch liquid line. All stocked SKUs have 1/2-inch elastomeric insulation.

Are DURO LINE line sets compatible with R-410A refrigerant systems?

DURO LINE line sets are designed for use with standard HVAC refrigerants including R-410A and R-22. The steel tubing and elastomeric insulation are rated for the pressure and temperature ranges typical of these refrigerants. However, it is important to verify that the specific line set diameter and length match the system manufacturer's requirements for proper refrigerant flow and oil return. The line sets have plain ends, so field connections must be made using appropriate brazing or flaring techniques.

What is the insulation thickness on DURO LINE line sets, and does it meet building codes?

All DURO LINE line sets stocked by 3G Electric have a nominal insulation thickness of 1/2 inch. This thickness is common for residential and light commercial split systems and meets typical energy code requirements for thermal resistance in conditioned spaces. The elastomeric insulation also serves as a vapor barrier to prevent condensation on the suction line. For specific code compliance, consult local regulations, as requirements may vary by jurisdiction.

Can DURO LINE line sets be used for both new installations and retrofits?

Yes, DURO LINE line sets are suitable for both new installations and replacement or retrofit applications. The pre-insulated design simplifies installation by eliminating the need to field-apply insulation. The plain ends allow for connection to existing system components via brazing or flaring. When retrofitting, ensure that the line set length and diameters match the existing system's requirements to avoid performance issues. 3G Electric offers multiple lengths to accommodate common retrofit scenarios.

Does 3G Electric supply DURO LINE products?

Yes — 3G Electric (S) Pte. Ltd. supplies DURO LINE products. We stock the DURO LINE catalog and supply genuine factory-original products with full manufacturer warranty and technical support.