3/8 in. x 5/8 in. x 75 ft. Pre Insulated Copper Tube

75 Ft 3/8" x 5/8" Pre-Insulated Copper Tube

DABUND 75 ft 3/8" x 5/8" pre-insulated copper tube is a long-length HVAC refrigerant line set designed for compatible mini split air conditioners, heat pumps, split AC systems and refrigeration applications. The paired copper tubing combines factory-applied insulation with a continuous 75 ft coil to simplify extended refrigerant piping installations.

The line set contains one 3/8" copper tube and one 5/8" copper tube, equivalent to approximately 9.52 mm and 15.88 mm outside diameter. The total length is 75 ft, approximately 22.86 m, providing additional routing flexibility where indoor and outdoor HVAC units are positioned farther apart.

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 HVAC projects, climates and target markets.

Quick Answer: This product is a 75 ft / 22.86 m pre-insulated HVAC copper line set with 3/8" and 5/8" copper tubes, equivalent to approximately 9.52 mm and 15.88 mm.

Compatibility Notice: A 3/8" x 5/8" line set and a 75 ft refrigerant run are not suitable for every HVAC system. Always verify the required tube diameters, maximum piping length, vertical separation, insulation requirements and refrigerant charging instructions in the equipment manufacturer's installation manual.

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

Key Features of the 75 Ft Pre-Insulated Copper Tube

C12200 Copper for HVACR Applications

DABUND uses C12200 DHP copper tubing for air-conditioning and refrigeration applications. The 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 product configuration. HVAC buyers can confirm tube dimensions, wall thickness and technical requirements before placing an order.

3/8" x 5/8" Paired Refrigerant Tubing

The line set combines 3/8" and 5/8" outside-diameter copper tubes. These correspond to approximately 9.52 mm and 15.88 mm. Their specific liquid-line and suction-line functions depend on the connected HVAC equipment and must follow the manufacturer's piping specifications.

75 Ft Continuous Refrigerant Line

The approximately 22.86 m continuous coil is designed for installations that require longer routing between indoor and outdoor HVAC units. Where permitted by the equipment manufacturer, a continuous long line can reduce the need to join multiple shorter sections of copper tubing.

Factory-Applied Black Rubber Insulation

Factory-applied insulation helps reduce on-site preparation and provides consistent coverage around the copper tubing. Closed-cell insulation also helps reduce thermal transfer and condensation during HVAC operation.

Multiple Insulation Thickness Options

DABUND offers multiple insulation thicknesses including 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm according to the required product configuration and market specification.

OEM Insulation Printing

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

High-Purity Copper Tubing

Black Rubber Insulated Pipe

Protective Plastic Caps

Black Rubber Pipe Insulation Features

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

• Closed-cell structure helps reduce moisture penetration.

• Low thermal conductivity helps reduce unwanted heat transfer.

• Insulation helps control condensation on cold refrigerant tubing.

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

• Multiple insulation thicknesses are available for different HVAC projects.

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

Thermal Insulation

The closed-cell insulation structure helps reduce thermal transfer between the refrigerant piping and surrounding air, supporting stable refrigerant conditions when the HVAC system is correctly designed and installed.

Condensation and Moisture Control

Proper insulation helps reduce condensation on cold refrigerant lines. Correct insulation thickness and sealed joints are especially important on long refrigerant runs where more piping surface is exposed to ambient air.

UV and Weather Resistance

UV-resistant insulation options are available for installations where refrigerant piping is exposed outdoors. Additional protective line covers may be used where required by project conditions or local 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 applicable test documentation required for their market.

When Should You Choose a 75 Ft HVAC Line Set?

A 75 ft HVAC line set is designed for installations where the indoor and outdoor units require substantially more routing distance than standard 10 ft, 20 ft, 25 ft or 50 ft line sets can provide.

Longer refrigerant routes may be required in multi-story buildings, apartments, rooftop installations, mechanical rooms or projects where the condenser must be positioned farther away from the indoor unit.

A continuous 75 ft coil can help reduce intermediate copper joints compared with joining several shorter tubing sections, provided that the HVAC manufacturer permits the required piping length.

Do not assume that every HVAC unit can accept a 75 ft line. Maximum actual length, equivalent piping length, vertical separation and refrigerant charge vary by manufacturer and model.

Installation Considerations for a 75 Ft Refrigerant Line

Confirm the Total Installation Path

Measure the actual routing distance before installation, including horizontal runs, vertical sections and bends. Compare the required length with the equipment manufacturer's maximum actual and equivalent piping limits.

Check Vertical Separation

Long HVAC installations may also include significant elevation differences between indoor and outdoor units. Confirm the maximum permitted vertical separation in the equipment installation manual.

Protect Insulation at Wall Penetrations

Use suitable sleeves, covers or protective materials where insulated copper tubing passes through walls, ceilings or other structures to reduce abrasion and insulation damage.

Support Long Refrigerant Runs

Long piping sections should be properly supported according to professional HVAC installation practices to reduce sagging, vibration and mechanical stress on the copper tubing and insulation.

Check Additional Refrigerant Requirements

Some HVAC systems are factory-charged only for a specified standard piping length. Longer installations may require additional refrigerant according to the equipment manufacturer's charging instructions.

75 Ft Copper Line Set for HVAC Wholesalers

DABUND supplies pre-insulated copper tubing to HVAC wholesalers, distributors, importers, contractors, refrigeration suppliers and private-label brands. Long-length coils such as 75 ft provide distributors with additional options for projects where standard short refrigerant lines are insufficient.

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

For project and wholesale buyers, DABUND also provides multiple paired copper tube dimensions and insulation configurations to support different HVAC markets.

Available Pre-Insulated Copper Tube Sizes

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

Is a 3/8" x 5/8" Line Set Compatible With My HVAC System?

A 3/8" x 5/8" line set is used by certain mini split air conditioners, heat pumps and split HVAC systems. However, refrigerant pipe size should not be selected solely according to BTU capacity or nominal tonnage.

The 3/8" tube has an outside diameter of approximately 9.52 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 systems in approximately 36,000 to 48,000 BTU capacity ranges may specify 3/8" x 5/8" refrigerant lines, but manufacturers can use different tube sizes for systems with similar capacities. The equipment installation manual should always be the final reference.

For a 75 ft installation, also verify maximum line length, equivalent piping length, vertical separation, refrigerant type, insulation thickness and any additional refrigerant charge.

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 HVAC wholesalers, distributors, importers, contractors and private-label brands.

Available OEM and ODM options include:

• Customized copper tube combinations

• Customized coil lengths

• Customized insulation thickness

• Company name and specification printing

• Customized insulation configurations

• 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 other industry buyers.

Frequently Asked Questions

What is a 75 ft 3/8" x 5/8" pre-insulated copper tube?

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 75 ft or 22.86 m.

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

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

How long is a 75 ft HVAC line set in meters?

75 ft is approximately 22.86 meters.

Why choose a 75 ft line set instead of a 50 ft line set?

A 75 ft line set provides approximately 25 ft of additional routing length compared with a 50 ft coil. It is useful when indoor and outdoor HVAC equipment are positioned farther apart and a continuous longer refrigerant run is permitted.

Can every mini split use a 75 ft refrigerant line?

No. Maximum refrigerant piping length varies by manufacturer and model. Always check the equipment installation manual before ordering or installing a 75 ft line set.

Is a 3/8" x 5/8" line set suitable for every 36K or 48K system?

No. Some systems in these capacity ranges may specify 3/8" x 5/8" tubing, but refrigerant line dimensions vary by manufacturer and model. Always verify the required tube sizes in the equipment installation manual.

Does a 75 ft installation require additional refrigerant?

It depends on the HVAC equipment. Many systems include a factory refrigerant charge for a specified standard line length and require additional refrigerant beyond that length. Follow the manufacturer's charging specification 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 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 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 the production schedule.