1/4 in. x 5/8 in. x 50 ft. Pre Insulated Copper Tube

50 Ft 1/4" x 5/8" Pre-Insulated Copper Tube

DABUND 50 ft 1/4" x 5/8" pre-insulated copper tube is a paired HVAC refrigerant line set designed for compatible mini split air conditioners, heat pumps, split AC systems and refrigeration applications. The two copper refrigerant tubes are supplied with factory-applied insulation to simplify installation and reduce on-site insulation work.

The line set combines a 1/4" copper tube and a 5/8" copper tube, equivalent to approximately 6.35 mm and 15.88 mm outside diameter. The total coil length is 50 ft, approximately 15.24 m, providing a continuous refrigerant piping solution for installations that require more routing distance than shorter line sets.

The copper tubing uses C12200 DHP copper for air-conditioning and refrigeration applications, with ASTM B280 specifications available according to the ordered configuration. Black rubber insulation is available in multiple thicknesses for different climates, markets and HVAC project requirements.

Quick Answer: This product is a 50 ft / 15.24 m pre-insulated HVAC copper line set containing 1/4" and 5/8" copper tubing, equivalent to approximately 6.35 mm and 15.88 mm.

Compatibility Notice: A 1/4" x 5/8" refrigerant line set is not suitable for every mini split or HVAC system. Always verify the required copper tube dimensions, permitted piping length, insulation requirements and refrigerant charging instructions in the equipment manufacturer's installation manual.

50 Ft 1/4" x 5/8" Copper Line Set Specifications

Key Features of the 50 Ft Pre-Insulated Copper Tube

C12200 Copper for HVACR Applications

DABUND uses C12200 DHP copper tubing for air-conditioning and refrigeration applications. The copper material provides the formability, thermal conductivity and corrosion resistance required for professional refrigerant piping.

ASTM B280 Copper Tubing Specification

ASTM B280 copper tubing specifications are available according to the ordered configuration. HVAC distributors, wholesalers and project buyers can confirm tube dimensions, wall thickness and technical requirements before placing an order.

1/4" Liquid Line and 5/8" Suction Line

On compatible HVAC equipment, the 1/4" tube commonly serves as the liquid line while the 5/8" tube serves as the suction or gas line. The exact piping configuration must always match the indoor and outdoor unit manufacturer's specifications.

50 Ft Continuous Refrigerant Line

The 50 ft / 15.24 m continuous coil provides greater routing flexibility than shorter 10 ft, 20 ft or 25 ft line sets. Where permitted by the HVAC equipment manufacturer, a continuous line can reduce the need to join multiple shorter copper sections.

Factory-Applied Black Rubber Insulation

Factory-applied closed-cell insulation helps reduce field preparation and provides consistent coverage around the copper tubing. Proper insulation helps reduce thermal transfer and condensation on refrigerant lines.

Multiple Insulation Thickness Options

Available insulation thicknesses include 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm according to product configuration, climate conditions and target-market requirements.

OEM Insulation Printing

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

High-Purity Copper Tubing

Black Rubber Insulated Pipe

Protective Plastic Caps

Black Rubber Pipe Insulation Performance

Closed-cell black rubber insulation is designed to help reduce heat transfer, limit moisture penetration and control condensation on refrigerant tubing. It also provides additional protection to the copper pipe during transportation, routing and HVAC operation.

• Closed-cell structure helps reduce moisture penetration.

• Low thermal conductivity helps reduce unwanted heat transfer.

• Insulation helps control surface condensation.

• UV-resistant insulation options are available for exposed applications.

• Multiple insulation thicknesses support different HVAC projects.

• Selected specifications support temperatures from approximately -40°C to 120°C.

Thermal Insulation

The high-density closed-cell structure helps reduce thermal transfer between the refrigerant tubing and surrounding air, supporting stable refrigerant conditions when the HVAC system is properly designed and installed.

Condensation Control

Correctly selected insulation helps reduce condensation on cold refrigerant lines. Sealed insulation joints and suitable thickness are important for maintaining moisture control throughout the piping route.

UV and Weather Resistance

UV-resistant insulation options are available where portions of the refrigerant line are exposed outdoors. Additional protective line covers can also be used according to project conditions and local HVAC installation practices.

Insulation Testing Options

Available insulation specifications include testing related to ASTM E84, UL 94, ASTM D1056 and ASTM G21 according to the original product information. Buyers should confirm the exact insulation grade and required test documentation before ordering.

When Should You Choose a 50 Ft HVAC Line Set?

A 50 ft refrigerant line set is suitable for compatible HVAC installations where shorter 10 ft, 20 ft or 25 ft line sets do not provide enough routing distance between the indoor and outdoor equipment.

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

Compared with combining multiple short tubing sections, one continuous 50 ft coil can reduce intermediate connection points and simplify routing when the HVAC manufacturer's specifications permit the required line length.

Do not assume that the full 50 ft length can be used with every system. Confirm minimum and maximum piping length, equivalent length, vertical separation, bend limitations and refrigerant-charge requirements before installation.

Installation Considerations for a 50 Ft Refrigerant Line

Measure the Actual Refrigerant Piping Route

Measure the complete installation path before cutting or installing the tubing. Include horizontal runs, vertical sections, wall penetrations and bends when calculating the required length.

Check Maximum Equivalent Length

The actual physical length and equivalent piping length can be different because elbows and routing conditions may affect the manufacturer's allowable refrigerant piping limits.

Confirm Vertical Separation

Check the maximum permitted elevation difference between indoor and outdoor units, especially where equipment is installed on different floors or on a rooftop.

Protect the Insulation

Protect the insulation at wall penetrations and exposed sections to reduce abrasion, compression and UV damage. Damaged insulation should be properly repaired to maintain thermal and moisture performance.

Check Additional Refrigerant Requirements

Some HVAC systems include a factory refrigerant charge for only a specified standard line length. A longer 50 ft installation may require additional refrigerant according to the equipment manufacturer's charging instructions.

50 Ft Copper Line Set for HVAC Wholesalers

DABUND supplies pre-insulated copper tubing to HVAC wholesalers, distributors, refrigeration suppliers, importers, contractors, project companies and private-label brands.

The 50 ft 1/4" x 5/8" configuration provides distributors with a practical inventory option for compatible residential and light-commercial HVAC applications requiring more refrigerant piping than standard short line sets.

OEM and ODM services can include customized copper tube combinations, coil lengths, insulation thickness, insulation printing, company branding and export packaging.

Available Pre-Insulated Copper Tube Sizes

DABUND manufactures multiple paired copper tube combinations, insulation thicknesses and coil lengths for air-conditioning and refrigeration applications.

Is a 1/4" x 5/8" Line Set Compatible With My HVAC System?

A 1/4" x 5/8" copper line set is used by certain mini split air conditioners, heat pumps and split HVAC systems. However, refrigerant tube dimensions should not be selected only according to BTU rating or nominal tonnage.

The 1/4" tube has an outside diameter of approximately 6.35 mm, while the 5/8" tube has an outside diameter of approximately 15.88 mm. Verify that these exact dimensions match the connected indoor and outdoor equipment.

Some HVAC systems in approximately 24,000 to 30,000 BTU capacity ranges may specify 1/4" x 5/8" refrigerant tubing, but manufacturers can use different pipe sizes for systems with similar capacities. The equipment installation manual should always be the final reference.

For a 50 ft installation, also confirm maximum actual line length, equivalent piping length, vertical separation, insulation thickness, refrigerant type and any additional refrigerant-charge requirement.

Refrigerant piping, pressure testing, evacuation, brazing, flaring and refrigerant charging should be completed by qualified HVAC personnel according to local regulations and equipment manufacturer instructions.

OEM Pre-Insulated Copper Tube Manufacturer

DABUND has manufactured insulated copper tubing, mini split line sets and HVAC components since 2008. Products are supplied to international HVAC wholesalers, distributors, importers, contractors and private-label brands.

Available OEM and ODM services include:

• Customized copper tube combinations

• Customized coil lengths

• Customized insulation thickness

• Company name and specification printing

• Customized insulation configuration

• Private-label cartons and export packaging

• Bulk production for HVAC wholesalers and distributors

Why Choose DABUND Pre-Insulated Copper Tubing?

• HVAC copper tubing manufacturing experience since 2008

• C12200 DHP copper for air-conditioning and refrigeration applications

• ASTM B280 tubing specifications available

• Factory-applied insulation

• Multiple paired copper tube sizes

• Multiple coil lengths and insulation thicknesses

• OEM insulation printing and private-label services

• Bulk supply for HVAC wholesalers and distributors

DABUND Factory

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

SGS Testing and Insulation Standards

Available insulation specifications include testing related to ASTM E84, UL 94, ASTM D1056 and ASTM G21. Buyers should confirm the exact insulation grade, product configuration and required test documentation for their destination market.

International HVAC Exhibitions

DABUND participates in international exhibitions to present pre-insulated copper tubing, mini split line sets and HVAC products to distributors, importers, contractors and industry buyers.

Frequently Asked Questions

What is a 50 ft 1/4" x 5/8" pre-insulated copper tube?

It is a paired HVAC refrigerant line set containing 1/4" 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 1/4" and 5/8" copper tubing?

A 1/4" copper tube has an outside diameter of approximately 6.35 mm, while a 5/8" copper tube has an outside diameter of approximately 15.88 mm.

How long is a 50 ft HVAC line set in meters?

50 ft is approximately 15.24 meters.

What is the difference between the 1/4" and 5/8" refrigerant lines?

On many compatible systems, the 1/4" tube functions as the liquid line and the 5/8" tube as the suction or gas line. The exact function and required sizes must be confirmed in the equipment manufacturer's specifications.

Why choose a 50 ft copper line set?

A 50 ft line set provides additional routing flexibility where shorter copper line sets are insufficient. It may also reduce intermediate joints when a continuous 50 ft run is permitted by the HVAC equipment manufacturer.

Can every mini split use a 50 ft refrigerant line?

No. Maximum and minimum refrigerant piping lengths vary by HVAC manufacturer and model. Always check the equipment installation manual before purchasing or installing a 50 ft line set.

Is a 1/4" x 5/8" line set suitable for every 24K or 30K mini split?

No. Some systems in these capacity ranges may use 1/4" x 5/8" tubing, but refrigerant pipe dimensions vary by manufacturer and model. Always verify the required tube sizes in the equipment installation manual.

Does a 50 ft installation require additional refrigerant?

It depends on the HVAC system. Some units include a factory refrigerant charge for only a specified standard piping length and require additional refrigerant beyond that distance. Follow the manufacturer's charging instructions for the exact model.

What copper material does DABUND use?

DABUND uses C12200 DHP copper for air-conditioning and refrigeration applications, with ASTM B280 tubing specifications available according to the ordered configuration.

What insulation thicknesses are available?

Available insulation thicknesses include 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm depending on the required product configuration.

Does the insulation help reduce condensation?

Yes. Closed-cell insulation helps reduce moisture penetration and surface condensation when the appropriate insulation thickness is selected and properly installed.

Can DABUND print my company name on the insulation?

Yes. OEM printing can include company name, copper tube size, coil length and other product information according to customer requirements.

Can DABUND customize other copper tube sizes and lengths?

Yes. DABUND supplies multiple paired copper tube combinations including 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", with multiple coil lengths available.

Can I get samples before placing a bulk order?

Yes. DABUND provides sample support for product evaluation. You can visit the free sample page for additional information.

What payment terms are available?

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

What delivery terms are available?

Available international trade terms can include EXW, FOB, CFR and CIF. Buyers can confirm the preferred Incoterm when requesting a quotation.

What is the typical production lead time?

Standard production lead time is typically around 15–20 days according to the current product information. Actual lead time depends on order quantity, customization requirements, material availability and production schedule.