1/4" x 3/8" x 75 ft Insulated Copper Pipe for Split AC

75 Ft 1/4" x 3/8" Insulated Copper Pipe for Split AC

DABUND 75 ft 1/4" x 3/8" Insulated Copper Pipe is a pre-insulated twin copper refrigerant piping solution for compatible split air conditioners, ductless mini split systems and heat pumps.

The paired copper tubing includes a 1/4" tube and a 3/8" tube, equivalent to approximately 6.35 mm and 9.52 mm outside diameter. The continuous coil length is 75 ft, approximately 22.86 m.

On compatible HVAC equipment, the 1/4" tube commonly functions as the liquid refrigerant line while the 3/8" tube functions as the suction or gas return line. Exact refrigerant piping dimensions should always be verified against the specifications for the specific indoor and outdoor equipment combination.

High-purity copper tubing is available to ASTM B280 and C12200 DHP specifications according to the ordered configuration. The displayed product uses black rubber insulation designed to provide thermal protection and help control condensation around refrigerant piping.

Quick Answer: This product is a 75 ft / 22.86 m insulated copper pipe set containing 1/4" and 3/8" copper tubing, approximately 6.35 mm and 9.52 mm OD, with black rubber insulation for compatible split AC installations.

Compatibility Notice: A 75 ft refrigerant piping run is not suitable for every split AC system. Confirm the required tube sizes, maximum actual line length, equivalent piping length, vertical separation, refrigerant type and additional refrigerant requirements for the exact HVAC model.

75 Ft 1/4" x 3/8" Insulated Copper Pipe Specifications

Key Features of the 75 Ft Insulated Copper Pipe

1/4" Liquid Line and 3/8" Suction Line

On compatible split AC and heat pump systems, the smaller 1/4" copper tube commonly serves as the liquid refrigerant line while the larger 3/8" tube serves as the suction or gas return line.

Their approximate outside diameters are 6.35 mm and 9.52 mm. Refrigerant piping requirements vary between HVAC models, so both tube dimensions should be verified before ordering.

75 Ft Continuous Refrigerant Piping

The 75 ft / 22.86 m continuous coil provides an extended piping option for compatible split AC installations where shorter refrigerant lines do not provide enough routing distance.

Where permitted by the equipment manufacturer, one continuous coil can reduce intermediate refrigerant piping joints compared with connecting multiple shorter copper sections.

C12200 DHP Copper Tubing

High-purity copper provides good formability, thermal conductivity and corrosion resistance for professional HVAC refrigerant piping applications.

ASTM B280 and C12200 DHP specifications are available according to the ordered configuration. Buyers requiring a specific tube wall thickness or pressure performance should confirm the applicable technical data before ordering.

Factory-Applied Black Rubber Insulation

The displayed configuration uses black rubber closed-cell insulation around the copper tubing to provide thermal protection and help control condensation along the refrigerant piping route.

Multiple Insulation Thickness Options

Available black rubber insulation thicknesses include 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm according to the selected configuration.

OEM Printing and Private Label Supply

Company name, copper tube dimensions, coil length and other product identification can be printed on the insulation for HVAC distributors, wholesalers, importers and private-label brands.

High-Purity Copper

Black Rubber Insulated Pipe

Protective Plastic Caps

Black Rubber Insulation for Split AC Copper Pipe

Closed-cell black rubber insulation helps reduce unwanted heat transfer and moisture penetration while supporting condensation control around refrigerant copper tubing.

• Closed-cell structure for moisture resistance

• Thermal protection for refrigerant piping

• Helps reduce surface condensation

• Flexible construction for extended piping routes

• UV-resistant configurations available

• Multiple insulation thickness options

• Selected configurations with temperature ranges from approximately -40°C to 120°C

Thermal Protection

The closed-cell insulation structure helps reduce heat transfer between the refrigerant tubing and surrounding air.

Condensation Control

Black rubber insulation helps reduce water-vapor penetration and surface condensation. Insulation joints and field-repaired sections should be properly sealed during installation.

Flexible Extended-Run Routing

Flexible insulation helps installers route longer refrigerant piping through walls, ceilings, attics, service shafts and mechanical spaces while protecting the copper tubing.

UV-Resistant Options

UV-resistant insulation configurations are available for outdoor piping sections. Additional line covers may be used where greater weather or mechanical protection is required.

Insulation Testing Options

Available insulation configurations include testing related to ASTM E84, UL 94, ASTM D1056, ASTM G21, ASTM C1427 and UL 723 according to the selected insulation material and specification. Buyers should confirm applicable documentation for the exact product configuration being ordered.

Why Choose a 75 Ft Insulated Copper Pipe?

A 75 ft insulated copper pipe set provides an extended-length option for compatible split AC installations where shorter refrigerant piping cannot reach between the indoor and outdoor units.

The 22.86 m continuous coil can be useful where refrigerant piping must pass through multiple rooms, ceilings, attics, service shafts or other building spaces before reaching the outdoor equipment.

A continuous copper coil can reduce intermediate piping joints, but the exact HVAC equipment must permit the actual and equivalent refrigerant piping length.

75 Ft Split AC Piping Installation Considerations

Verify the Required 1/4" x 3/8" Pipe Sizes

Confirm that the exact indoor and outdoor HVAC equipment requires approximately 6.35 mm and 9.52 mm outside-diameter refrigerant tubing. Do not select refrigerant pipe dimensions only from system capacity.

Confirm Maximum Actual Piping Length

Verify that the equipment manufacturer permits approximately 75 ft / 22.86 m of actual refrigerant piping. Some split AC systems have maximum line-length limits below this distance.

Calculate Equivalent Piping Length

Elbows, bends and routing conditions can affect equivalent refrigerant piping length. Follow the equipment manufacturer's equivalent-length calculation method where specified.

Check Maximum Vertical Separation

If indoor and outdoor equipment are installed at different elevations, confirm the maximum permitted vertical separation specified by the HVAC equipment manufacturer.

Confirm Additional Refrigerant Requirements

Some split AC systems include a factory refrigerant charge for only a specified standard piping length. A 75 ft installation may require additional refrigerant according to the manufacturer's charging instructions.

Review Extended-Line Installation Requirements

Some HVAC manufacturers specify additional requirements for extended refrigerant piping runs. Review the installation manual for the exact equipment before planning a 75 ft refrigerant line.

Support Long Horizontal and Vertical Sections

Extended refrigerant piping should be properly supported to reduce sagging, vibration and mechanical stress on the copper tubing, insulation and field connections.

Protect Insulation at Structural Penetrations

Use suitable sleeves, grommets or other protection where insulated copper piping passes through walls, floors, roofs or other structural openings.

Is 1/4" x 3/8" Compatible With My Split AC?

The 1/4" x 3/8" refrigerant piping combination is used by selected ductless mini split air conditioners and heat pump systems.

Some systems in approximately 9,000–12,000 BTU classes may use these dimensions, but this is not a universal sizing rule.

Equipment with similar nominal capacity can require different refrigerant pipe dimensions. Always verify the required liquid-line and suction-line sizes for the exact equipment model.

Applications of the 75 Ft Insulated Copper Pipe

Split Air Conditioning Systems

Suitable for compatible split AC systems that specifically require 1/4" and 3/8" refrigerant piping and permit the required extended piping length.

Ductless Mini Split Systems

Can be supplied for compatible ductless mini split systems using this paired copper tube combination.

Heat Pump Systems

Suitable for compatible heat pump systems where the manufacturer's specified pipe dimensions and maximum piping length match this configuration.

Multi-Level HVAC Installations

The 75 ft coil can provide additional routing flexibility in compatible multi-level installations, provided that the manufacturer's vertical-separation requirements are followed.

Residential and Light-Commercial Projects

The 22.86 m length can support compatible residential and light-commercial installations where building layout requires an extended refrigerant piping route.

Available Insulated Copper Pipe Sizes

Insulated Copper Pipe for HVAC Distributors

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

The 75 ft 1/4" x 3/8" black rubber insulated configuration provides an extended-length stocking option for buyers serving compatible split AC, mini split and heat pump installations.

OEM and Custom Insulated Copper Pipe Supply

DABUND supports OEM and ODM production for HVAC distributors, importers and private-label brands.

• Custom copper tube combinations

• Custom coil lengths

• Multiple insulation thicknesses

• Company name and specification printing

• Private-label packaging

• Custom product identification

• Bulk supply for distributors and project buyers

Why Choose DABUND Insulated Copper Pipe?

HVAC Manufacturing Experience Since 2008

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

Multiple Sizes, Lengths and Insulation Options

Multiple copper tube combinations, coil lengths and insulation thicknesses allow distributors to source refrigerant piping configurations according to installation and market requirements.

OEM and Private-Label Support

Insulation printing, product identification and packaging can be customized for HVAC brands, wholesalers and distributors.

DABUND Factory and Export Packaging

DABUND manufactures insulated copper pipe, mini split line sets and related 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 insulation material and specification. Buyers should confirm applicable documentation for the exact product configuration being ordered.

International HVAC Exhibitions

DABUND participates in international HVAC exhibitions to present insulated copper pipe, mini split line sets and related HVAC products to distributors, importers and professional buyers.

Frequently Asked Questions

What is a 75 ft 1/4" x 3/8" insulated copper pipe set?

It is a paired refrigerant piping system containing 1/4" and 3/8" outside-diameter copper tubing with factory-applied insulation. The coil length is approximately 75 ft or 22.86 m.

What are the metric sizes of 1/4" and 3/8" copper tubing?

A 1/4" copper tube has an outside diameter of approximately 6.35 mm, while a 3/8" copper tube has an outside diameter of approximately 9.52 mm.

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

On compatible HVAC systems, the 1/4" tube commonly functions as the liquid line while the 3/8" tube functions as the suction or gas line. Always verify the equipment manufacturer's piping specification.

What split AC capacity uses a 1/4" x 3/8" pipe set?

Some systems in approximately 9,000–12,000 BTU classes may use this pipe combination, but this is not a universal sizing rule. Similar-capacity equipment can require different refrigerant pipe dimensions.

Can I select the insulated copper pipe by BTU capacity alone?

No. Refrigerant pipe sizing depends on equipment design, refrigerant type, actual piping length, vertical separation and manufacturer specifications.

Can every split AC use a 75 ft refrigerant pipe?

No. Verify that approximately 75 ft / 22.86 m falls within the maximum actual and equivalent refrigerant piping limits permitted by the exact equipment model.

Does a 75 ft installation require additional refrigerant?

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

Does vertical separation matter with a 75 ft piping run?

Yes. Verify the maximum permitted vertical separation between indoor and outdoor equipment before planning an extended refrigerant piping route.

What is equivalent refrigerant piping length?

Actual length is the measured copper piping route. Equivalent length may also account for bends and other piping conditions according to the equipment manufacturer's calculation method.

What insulation is shown on this product?

The displayed product configuration uses black rubber closed-cell insulation designed to provide thermal protection and help control condensation around refrigerant copper tubing.

What insulation thicknesses are available?

Available insulation thickness options include 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm depending on the selected configuration.

Is UV-resistant insulation available?

Yes. UV-resistant insulation configurations are available according to the selected insulation material and specification.

What pressure rating does the copper tubing have?

Allowable working and test pressure depends on copper tube diameter, wall thickness, material specification and ordered configuration. Buyers requiring a specific pressure rating should confirm the applicable technical data before ordering.

Can DABUND customize the insulated copper pipe?

Yes. OEM and ODM options include copper tube combinations, coil lengths, insulation thickness, printed identification and private-label packaging.

Can I get samples before placing a bulk order?

Yes. According to the current product information, DABUND can provide three sample pieces for evaluation, with the buyer covering express shipping costs. View sample 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 commercial agreement.

What delivery terms are available?

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

What is the typical delivery time?

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

Who should install a 75 ft insulated copper refrigerant pipe?

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