50 Ft 3/8" x 5/8" Pre-Insulated Copper Line Set

50 Ft 3/8" x 5/8" Pre-Insulated Copper Line Set

DABUND 50 ft 3/8" x 5/8" pre-insulated copper line set is designed for compatible mini split air conditioners, heat pumps, split AC systems and HVACR applications requiring extended refrigerant piping between indoor and outdoor equipment.

The paired copper tubing combines a 3/8" line and a 5/8" line, equivalent to approximately 9.52 mm and 15.88 mm outside diameter. The total coil length is 50 ft, approximately 15.24 m.

On compatible HVAC equipment, the 3/8" tube commonly functions as the liquid line while the 5/8" tube functions as the suction or gas line. Both tubing size and refrigerant piping length must match the equipment manufacturer's installation requirements.

DABUND supplies high-purity copper tubing with factory-applied PE or rubber insulation options, pre-flared ends and flare nuts according to the ordered configuration. ASTM B280 and C12200 specifications are available for HVAC and refrigeration applications.

Quick Answer: This product is a 50 ft / 15.24 m insulated HVAC refrigerant line set containing 3/8" and 5/8" copper tubing, approximately 9.52 mm and 15.88 mm OD, for compatible HVAC systems that specify these exact dimensions.

Compatibility Notice: Do not select a line set only by BTU or tonnage. Confirm the required liquid-line size, suction-line size, maximum actual and equivalent piping length, vertical separation, insulation requirement and refrigerant charging instructions for the exact HVAC model.

50 Ft 3/8" x 5/8" Copper Line Set Specifications

Key Features of the 3/8" x 5/8" HVAC Line Set

3/8" Liquid Line and 5/8" Suction Line

On compatible HVAC equipment, the smaller 3/8" tube commonly serves as the liquid line and the larger 5/8" tube as the suction or gas line. Their approximate metric outside diameters are 9.52 mm and 15.88 mm.

Pipe functions and required dimensions can vary by manufacturer and system design, so the equipment documentation should always be the final reference.

50 Ft Continuous Refrigerant Tubing

The 50 ft / 15.24 m coil provides additional routing flexibility when shorter line sets do not provide sufficient distance between indoor and outdoor units.

Where permitted by the HVAC manufacturer, a continuous refrigerant line can reduce intermediate connection points compared with joining several shorter sections of tubing.

High-Purity Copper for HVACR Applications

High-purity copper provides good formability, thermal conductivity and corrosion resistance for professional air-conditioning and refrigeration piping. C12200 and ASTM B280 specifications are available according to the ordered product configuration.

Pre-Flared Ends With Flare Nuts

Pre-flared ends and corresponding flare nuts can be supplied to simplify installation on compatible equipment. Installers should inspect flare surfaces and confirm the required flare specification and torque before making refrigerant connections.

Factory-Applied Insulation

Factory-applied insulation helps reduce field preparation while providing consistent thermal and condensation protection around the copper refrigerant tubing.

White PE and Black Rubber Options

White PE and black rubber insulation options are available for different climates, HVAC applications and destination-market requirements.

OEM Insulation Printing

Company name, pipe size, coil length and other product identification can be printed on the insulation for distributors, OEM customers and private-label HVAC brands.

High-Purity Copper Tubing

White PE Insulated Pipe

Flare Nut Connection

White PE Multi-Layer Insulation Structure

DABUND white PE insulation configurations use a multilayer structure designed to help reduce heat transfer, moisture penetration and mechanical damage during HVAC installation and operation.

Outer Protective Layer

The outer PE layer helps protect the insulation from abrasion, handling damage and environmental exposure. UV-resistant configurations are available for applications that include outdoor piping.

Middle IXPE Foam Layer

The middle foam layer helps reduce heat transfer while providing cushioning and moisture resistance around the refrigerant piping.

Closed-Cell Inner Layer

A closed-cell inner structure helps limit moisture penetration and supports condensation control on cold refrigerant tubing.

Insulation Pipe Production

Insulated Pipe Warehouse

Closed-Cell Inner Layer

Insulation Performance for HVAC Refrigerant Lines

Thermal Insulation

Suitable insulation helps reduce unwanted heat transfer between refrigerant tubing and surrounding air, supporting stable operating conditions when the HVAC system is correctly designed and installed.

Condensation Control

Closed-cell insulation helps reduce water-vapor penetration and surface condensation. Properly sealed insulation joints are especially important in humid environments.

UV Resistance

UV-resistant insulation options are available for installations that include outdoor refrigerant piping. Additional line-set covers or mechanical protection may be used where required by project conditions.

Insulation Testing Options

Available insulation specifications include testing related to ASTM E84, UL 94, ASTM D1056 and ASTM G21 according to the selected material configuration. Buyers should confirm that the relevant test report applies to the exact insulation being ordered.

When Should You Choose a 50 Ft 3/8" x 5/8" Line Set?

A 50 ft line set is useful for compatible HVAC installations where standard short piping does not provide enough distance between the indoor and outdoor units.

Typical routing may pass through walls, ceilings, attics, service spaces or around structural obstacles before reaching the outdoor condenser or heat pump.

A continuous 50 ft coil can reduce the need for intermediate copper joints compared with combining several shorter sections, provided that the HVAC manufacturer's permitted piping length is not exceeded.

Installation Considerations for a 50 Ft Refrigerant Line

Verify the Required Pipe Sizes

Confirm that the exact HVAC model requires 3/8" and 5/8" outside-diameter refrigerant tubing. Similar-capacity systems may use different pipe dimensions.

Check Maximum Actual and Equivalent Length

Check the equipment manufacturer's maximum permitted actual and equivalent refrigerant piping length. Bends and routing conditions can affect equivalent length even when the physical tubing length remains below 50 ft.

Confirm Vertical Separation

If the indoor and outdoor units are located at different elevations, verify the maximum permitted vertical separation in the manufacturer's installation documentation.

Check Additional Refrigerant Requirements

Some HVAC systems include a factory refrigerant charge for only a specified standard line length. Longer piping may require additional refrigerant according to the equipment manufacturer's charging instructions.

Protect Wall Penetrations

Use suitable sleeves or protective materials where insulated tubing passes through walls or structural openings to reduce abrasion and insulation damage.

Support Long Pipe Runs

Long horizontal and vertical runs should be properly supported according to professional HVAC installation practices to reduce vibration, sagging and mechanical stress.

Is a 3/8" x 5/8" Line Set Suitable for My HVAC System?

A 3/8" x 5/8" refrigerant line set is used by certain ductless mini split, heat pump and split-system air conditioners. Some equipment in approximately 36,000–48,000 BTU capacity ranges may specify these dimensions.

However, BTU or tonnage is not a universal sizing rule. Different manufacturers can specify different refrigerant line dimensions for systems with similar capacities.

Always use the exact indoor and outdoor unit installation manual to confirm liquid-line diameter, suction-line diameter, permissible line length and refrigerant charging requirements.

Applications of the 3/8" x 5/8" Copper Line Set

Ductless Mini Split Systems

Suitable for compatible ductless mini split systems that specify 3/8" and 5/8" refrigerant tubing.

Heat Pump Systems

Can be supplied for compatible heat pumps requiring this paired pipe size and suitable insulation for heating and cooling operation.

Residential and Light-Commercial HVAC

The 50 ft configuration provides additional routing flexibility for larger residential and light-commercial projects where shorter line sets are insufficient.

Refrigeration Applications

The insulated copper tubing can also be supplied for refrigeration applications where pipe diameter, wall thickness, insulation and pressure requirements match the system design.

Optional Complete Mini Split Installation Kit

This page is primarily for the insulated copper line set. For buyers requiring a complete installation package, DABUND can also supply separate installation-kit configurations that may include additional HVAC accessories.

• Insulated copper refrigerant tubing

• Communication cable

• Condensate drain hose

• Wall sleeve

• Decorative wall cover

• Other installation accessories according to ordered configuration

These accessories are not automatically included with the standalone copper line-set SKU. Confirm the required kit configuration before ordering.

Available Copper Line Set Sizes

50 Ft Copper Line Set for HVAC Distributors

DABUND supplies insulated copper line sets to HVAC wholesalers, distributors, importers, contractors, project companies and private-label brands.

The 3/8" x 5/8" configuration provides an additional stocking option for buyers serving compatible ductless, heat pump and split-system installations.

OEM and ODM HVAC Copper Line Sets

DABUND supports customized line-set supply for HVAC distributors, brands and project buyers.

• Custom copper tube combinations

• Custom coil lengths

• White PE or black rubber insulation

• Custom insulation thickness

• Logo and specification printing

• Pre-flared configurations according to order requirements

• Private-label packaging

• Bulk supply for distributors and project buyers

Why Choose DABUND as an HVAC Line Set Supplier?

HVAC Manufacturing Experience Since 2008

DABUND has manufactured HVAC components since 2008, supplying insulated copper tubing, mini split line sets, installation accessories and related HVAC products to international customers.

Bulk Production Capability

Bulk supply is available for wholesalers, distributors, HVAC contractors and project buyers requiring repeat orders or multiple specifications.

OEM and Private-Label Support

Insulation printing, product identification and private-label packaging can be customized according to commercial requirements.

Packaging and Delivery

Standard export packaging and customized packaging options are available. Current product information lists typical delivery at approximately 15–20 days, while actual timing depends on quantity, specification and production schedule.

DABUND Factory

DABUND manufactures insulated copper pipe, mini split line sets, aluminum pipe and other HVAC components for international B2B customers.

SGS Testing and Insulation Standards

Available insulation configurations include testing related to ASTM E84, UL 94, ASTM D1056 and ASTM G21 according to the selected product specification. Buyers should confirm the applicable test documentation for the exact material ordered.

International HVAC Exhibitions

DABUND participates in international HVAC exhibitions to present insulated copper tubing, refrigerant line sets and related HVAC products to distributors, importers and industry buyers.

Frequently Asked Questions

What is a 50 ft 3/8" x 5/8" insulated copper line set?

It is a paired HVAC refrigerant line set containing 3/8" and 5/8" copper tubing with factory-applied insulation. The total coil length is approximately 50 ft or 15.24 m.

What are the metric sizes of 3/8" and 5/8" copper tubing?

A 3/8" tube has an outside diameter of approximately 9.52 mm, while a 5/8" tube has an outside diameter of approximately 15.88 mm.

Which tube is the liquid line and which is the suction line?

On compatible HVAC equipment, the 3/8" tube commonly functions as the liquid line and the 5/8" tube as the suction or gas line. Always confirm this with the equipment manufacturer's piping specification.

What HVAC capacity uses a 3/8" x 5/8" line set?

Some systems in approximately 36,000–48,000 BTU ranges use 3/8" x 5/8" tubing, but this is not universal. Similar-capacity equipment can require different refrigerant pipe sizes.

Can I select the line set by tonnage alone?

No. Correct refrigerant tubing size depends on equipment design, refrigerant type, piping length, vertical separation and manufacturer requirements.

Why choose a 50 ft line set?

A 50 ft coil provides additional routing distance when shorter line sets are insufficient and may reduce intermediate tubing joints when the HVAC equipment permits a continuous 50 ft run.

Can every mini split use a 50 ft refrigerant line?

No. Maximum actual and equivalent refrigerant piping lengths vary by manufacturer and model. Check the installation manual before ordering.

Does a 50 ft installation require additional refrigerant?

It may. Some HVAC systems include a factory charge for only a specified standard piping length. Follow the manufacturer's instructions to determine whether additional refrigerant is required.

Are the copper tube ends pre-flared?

Pre-flared ends with flare nuts are available according to product configuration. Confirm the exact connection specification when placing an order.

What insulation options are available?

DABUND can supply white PE and black rubber insulation with multiple thickness options depending on the required product configuration.

Is UV-resistant insulation available?

Yes. UV-resistant insulation configurations are available for installations that include outdoor refrigerant piping.

Can DABUND provide a complete installation kit?

Yes. Separate installation-kit configurations can include insulated copper tubing, communication cable, drain hose, wall sleeve and other accessories. Confirm the required configuration before ordering.

Can DABUND customize this copper line set?

Yes. OEM and ODM options can include tube size, coil length, insulation material, insulation thickness, logo printing, product identification and private-label packaging.

Can I get samples before placing a bulk order?

Yes. DABUND provides sample support for product evaluation. Express shipping arrangements and the required sample specification should be confirmed before dispatch.

What payment terms are available?

Available payment methods can include T/T, L/C at sight and credit card. Final terms depend on the commercial agreement.

What delivery terms are available?

Available trade terms can include EXW, FOB, CFR and CIF according to the buyer's logistics requirements.

What is the typical production lead time?

Current product information lists typical delivery at approximately 15–20 days. Actual lead time depends on quantity, specification, customization and production schedule.

Who should install the refrigerant line set?

Refrigerant piping, flare connections, pressure testing, evacuation and refrigerant charging should be completed by qualified HVAC personnel according to local requirements and the equipment manufacturer's instructions.