3/8" x 7/8" x 25' Copper Line Set

25 Ft 3/8" x 7/8" Copper Line Set

DABUND 25 ft 3/8" x 7/8" Copper Line Set is a pre-insulated twin copper refrigerant piping solution for compatible split air conditioners, heat pumps, ductless HVAC systems and selected refrigeration applications.

The paired copper tubing includes a 3/8" tube and a 7/8" tube, equivalent to approximately 9.52 mm and 22.22 mm outside diameter. The continuous coil length is 25 ft, approximately 7.62 m.

On compatible HVAC equipment, the 3/8" tube commonly functions as the liquid refrigerant line while the 7/8" tube functions as the suction or gas return line. Exact refrigerant pipe dimensions should always be verified against the installation specifications for the specific equipment model.

High-purity copper tubing is combined with factory-applied black rubber insulation for thermal protection and condensation control. ASTM B280 and C12200 DHP copper specifications are available according to the ordered configuration.

Quick Answer: This product is a 25 ft / 7.62 m copper line set containing 3/8" and 7/8" pre-insulated copper tubing, approximately 9.52 mm and 22.22 mm OD, for compatible HVAC installations.

Compatibility Notice: Do not select refrigerant piping only by BTU capacity, tonnage or equipment brand. Confirm liquid-line size, suction-line size, permitted piping length, vertical separation, refrigerant type and charging requirements for the exact equipment model.

25 Ft 3/8" x 7/8" Copper Line Set Specifications

Key Features of the 3/8" x 7/8" Copper Line Set

3/8" Liquid Line and 7/8" Suction Line

On compatible HVAC equipment, the smaller 3/8" copper tube commonly serves as the liquid refrigerant line while the larger 7/8" tube serves as the suction or gas return line.

Their approximate outside diameters are 9.52 mm and 22.22 mm. Refrigerant pipe dimensions vary between equipment manufacturers and models, so both sizes should be verified before ordering.

25 Ft Continuous Copper Refrigerant Piping

The 25 ft / 7.62 m continuous coil is suited to compatible installations where very short piping is insufficient but a 50 ft or longer line set would create unnecessary excess copper tubing.

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 production.

Factory-Applied Black Rubber Insulation

The displayed configuration uses factory-applied black rubber insulation to provide thermal protection and help control condensation around refrigerant copper tubing.

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 product 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 Insulation

Protective Plastic Caps

Black Rubber Insulation for Copper Line Sets

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 installation routing

• 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 structure helps reduce heat transfer between refrigerant tubing and surrounding air.

Condensation Control

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

Flexible Routing

Flexible insulation helps installers route the copper line set through walls, ceilings, attics and mechanical spaces while protecting the copper surface during normal installation handling.

UV-Resistant Options

UV-resistant insulation configurations are available for outdoor refrigerant 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 material specification. Buyers should confirm applicable documentation for the exact configuration being ordered.

Why Choose a 25 Ft Copper Line Set?

A 25 ft copper line set provides a practical middle-length option for compatible HVAC installations where a very short refrigerant line does not provide enough routing distance.

Compared with a 50 ft or longer coil, the 25 ft / 7.62 m configuration can reduce unused copper tubing where the indoor and outdoor units are installed at a moderate distance from each other.

Where permitted by the equipment manufacturer, one continuous 25 ft coil can also reduce intermediate refrigerant piping joints compared with joining shorter tubing sections.

Installation Considerations for a 25 Ft Copper Line Set

Verify the Required 3/8" x 7/8" Pipe Sizes

Confirm that the exact HVAC equipment requires approximately 9.52 mm and 22.22 mm outside-diameter refrigerant tubing. Similar-capacity systems can use different line sizes.

Check Minimum and Maximum Piping Length

Verify that approximately 25 ft / 7.62 m falls within the equipment manufacturer's permitted refrigerant piping range. Some HVAC systems specify both minimum and maximum line lengths.

Check Equivalent Piping Length

Bends and routing conditions may increase equivalent piping length. Follow the equipment manufacturer's calculation method where equivalent-length limits are specified.

Confirm Vertical Separation

Where indoor and outdoor equipment are installed at different elevations, confirm the manufacturer's maximum permitted vertical separation.

Follow Refrigerant Charging Requirements

Follow the equipment manufacturer's factory-charge and piping instructions. Whether additional refrigerant is required depends on the model and the manufacturer's specified pre-charge length.

Protect the Insulation

Use suitable sleeves, grommets or other protection where insulated copper tubing passes through walls, floors or structural openings to reduce abrasion and insulation damage.

Is 3/8" x 7/8" Compatible With My HVAC System?

The 3/8" x 7/8" refrigerant piping combination is used by selected higher-capacity split air conditioners, heat pumps and ductless HVAC systems.

Some systems in approximately 72,000–96,000 BTU classes may use these dimensions, but this is not a universal sizing rule.

Equipment with similar nominal capacity can require different liquid-line and suction-line sizes. Always verify the exact equipment specification before purchasing.

Applications of the 25 Ft 3/8" x 7/8" Copper Line Set

Split Air Conditioning Systems

Suitable for compatible split-system air conditioners that specifically require 3/8" and 7/8" refrigerant tubing.

Heat Pump Systems

Can be supplied for compatible heat pump installations using this paired refrigerant tube combination.

Ductless HVAC Systems

Suitable for selected ductless systems where the equipment manufacturer's specified refrigerant piping dimensions match this line set.

Residential and Light-Commercial Projects

The 25 ft length provides a practical routing option for compatible residential and light-commercial HVAC installations where the indoor and outdoor units are moderately separated.

Selected Refrigeration Applications

The insulated copper tubing can also be supplied for selected refrigeration applications where tube size, wall thickness, insulation and operating requirements match the system design.

Available Copper Line Set Sizes

Copper Line Sets for HVAC Distributors and Contractors

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

The 25 ft 3/8" x 7/8" configuration provides a mid-length stocking option for buyers serving compatible split-system, heat pump and ductless HVAC installations.

OEM and Custom Copper Line Set 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 Copper Line Sets?

HVAC Manufacturing Experience Since 2008

DABUND has manufactured HVAC components since 2008, supplying copper line sets, mini split line sets, insulated copper tubing 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 different refrigerant piping configurations according to market and project 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, copper 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 material specification. Buyers should confirm applicable documentation for the exact insulation configuration being ordered.

International HVAC Exhibitions

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

Frequently Asked Questions

What is a 25 ft 3/8" x 7/8" copper line set?

It is a paired refrigerant piping system containing 3/8" and 7/8" outside-diameter copper tubing with pre-applied insulation. The coil length is approximately 25 ft or 7.62 m.

What are the metric sizes of 3/8" and 7/8" copper tubing?

The product information lists approximately 9.52 mm outside diameter for the 3/8" tube and approximately 22.22 mm for the 7/8" tube.

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 7/8" tube as the suction or gas line. Always verify the equipment manufacturer's piping specification.

What HVAC capacity uses a 3/8" x 7/8" copper line set?

Some higher-capacity systems in approximately 72,000–96,000 BTU classes may use this pipe combination, but this is not universal. Similar-capacity equipment can require different refrigerant pipe dimensions.

Can I select the copper line set by BTU or tonnage alone?

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

When should I choose a 25 ft copper line set?

A 25 ft line set is useful where a short refrigerant run does not provide enough routing distance but a 50 ft or longer coil would create unnecessary excess tubing.

Can every HVAC system use a 25 ft line set?

No. Verify that approximately 25 ft / 7.62 m falls within the minimum and maximum refrigerant piping limits specified for the exact equipment model.

Does a 25 ft line set require additional refrigerant?

It depends on the equipment. Some HVAC systems include a factory refrigerant charge for only a specified standard piping length. Follow the manufacturer's charging instructions for the exact model.

What insulation is shown on this copper line set?

The displayed product configuration uses black rubber closed-cell insulation designed to provide thermal protection and help control condensation around refrigerant 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 for refrigerant piping sections installed outdoors.

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 copper line set?

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 copper refrigerant line set?

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