3/8" x 5/8" 20 ft Mini Split Line Set

20 Ft 3/8" x 5/8" Mini Split Line Set

DABUND 20 ft 3/8" x 5/8" Mini Split Line Set is a pre-insulated twin copper refrigerant piping solution for compatible ductless mini split air conditioners, heat pumps and split HVAC systems.

The paired copper tubing includes a 3/8" tube and a 5/8" tube, equivalent to approximately 9.52 mm and 15.88 mm outside diameter. The coil length is 20 ft, approximately 6.096 m.

On compatible HVAC equipment, the 3/8" tube commonly functions as the liquid refrigerant line while the 5/8" tube functions as the suction or gas return line. Exact refrigerant piping dimensions should always be verified against the installation specifications for the specific indoor and outdoor equipment combination.

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 20 ft / 6.096 m pre-insulated mini split line set containing 3/8" and 5/8" copper tubing, approximately 9.52 mm and 15.88 mm OD, for compatible HVAC installations.

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

20 Ft 3/8" x 5/8" Line Set Specifications

Key Features of the 20 Ft Mini Split Line Set

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

On compatible mini split and heat pump systems, the smaller 3/8" copper tube commonly serves as the liquid refrigerant line while the larger 5/8" tube serves as the suction or gas return line.

Their approximate outside diameters are 9.52 mm and 15.88 mm. Because refrigerant piping requirements vary between manufacturers and models, both dimensions should be verified before ordering.

20 Ft Continuous Copper Refrigerant Piping

The 20 ft / 6.096 m continuous coil provides a practical length for compatible installations where a 10 ft line set is too short but a 30 ft or 50 ft coil would create unnecessary excess tubing.

Where permitted by the equipment manufacturer, a continuous copper coil can reduce intermediate refrigerant piping joints compared with connecting multiple shorter tubing 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 line-set configuration uses black rubber closed-cell insulation to provide thermal protection and help control condensation around the 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 Mini Split 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 field-repaired sections should be properly sealed during installation.

Flexible Routing

Flexible insulation helps contractors route refrigerant piping through walls, ceilings, attics and mechanical spaces while protecting the copper tubing during installation.

UV-Resistant Options

UV-resistant insulation configurations are available for outdoor refrigerant piping sections. Additional line-set 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 insulation configuration being ordered.

Why Choose a 20 Ft Mini Split Line Set?

A 20 ft line set provides a practical intermediate option for compatible HVAC installations where a short 10 ft refrigerant route is not sufficient.

Compared with a 30 ft or 50 ft coil, the 20 ft / 6.096 m configuration can reduce unused copper tubing where the indoor and outdoor units are installed relatively close to each other.

Correctly matching the line-set length to the planned piping route can simplify installation and reduce unnecessary coiled tubing.

Installation Considerations for a 20 Ft Line Set

Verify the Required 3/8" x 5/8" Pipe Sizes

Confirm that the exact HVAC equipment requires approximately 9.52 mm and 15.88 mm outside-diameter refrigerant tubing. Similar-capacity systems can use different pipe sizes.

Check Minimum and Maximum Piping Length

Verify that approximately 20 ft / 6.096 m falls within the equipment manufacturer's permitted refrigerant piping range. Some HVAC systems specify both minimum and maximum line lengths.

Plan the Actual Routing Distance

Measure the complete refrigerant piping route rather than only the straight-line distance between indoor and outdoor equipment. Allow for wall penetrations, bends and required connection lengths.

Confirm Vertical Separation

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

Follow Refrigerant Charging Instructions

Follow the equipment manufacturer's factory-charge and piping instructions. Whether refrigerant adjustment is required depends on the exact system and its specified pre-charge length.

Protect the Insulation at Wall Penetrations

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

Is 3/8" x 5/8" Compatible With My Mini Split?

The 3/8" x 5/8" refrigerant piping combination is used by selected ductless mini split air conditioners, heat pumps and split HVAC systems.

Some equipment in approximately 36,000–48,000 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 ordering.

Applications of the 20 Ft 3/8" x 5/8" Line Set

Ductless Mini Split Air Conditioners

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

Heat Pump Systems

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

Residential HVAC Installation

The 20 ft length provides a practical routing option for compatible residential installations where indoor and outdoor equipment are positioned at a moderate distance from each other.

Light-Commercial HVAC Projects

Suitable for compatible light-commercial installations where refrigerant tube dimensions, line length and insulation requirements match this configuration.

Available Mini Split Line Set Sizes

20 Ft Mini Split Line Set for HVAC Distributors

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

The 20 ft 3/8" x 5/8" configuration provides a practical stocking option for buyers serving compatible mini split and heat pump installations where short-to-medium refrigerant piping runs are required.

OEM and Custom Mini Split 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 Mini Split Line Sets?

HVAC Manufacturing Experience Since 2008

DABUND has manufactured HVAC components since 2008, supplying 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 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 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 mini split line sets, insulated copper tubing and related HVAC products to distributors, importers and professional buyers.

Frequently Asked Questions

What is a 20 ft 3/8" x 5/8" mini split line set?

It is a paired refrigerant piping system containing 3/8" and 5/8" outside-diameter copper tubing with pre-applied insulation. The coil length is approximately 20 ft or 6.096 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.

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

On compatible systems, the 3/8" tube commonly functions as the liquid line and the 5/8" tube as the suction or gas line. Always verify 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 classes may use this pipe combination, but this is not universal. Similar-capacity equipment can require different refrigerant pipe dimensions.

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

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

When should I choose a 20 ft mini split line set?

A 20 ft line set is useful where a 10 ft refrigerant line is too short but a 30 ft or 50 ft coil would create unnecessary excess tubing.

Can every mini split use a 20 ft line set?

No. Verify that approximately 20 ft / 6.096 m falls within the minimum and maximum refrigerant piping limits specified for the exact equipment model.

Does a 20 ft line set require refrigerant adjustment?

It depends on the equipment. Follow the manufacturer's specified factory-charge length and refrigerant charging instructions for the exact HVAC model.

What insulation is shown on this mini split 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 mini split line set?

Yes. OEM and ODM options include copper tube combinations, coil lengths, insulation thickness, insulation printing, product 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 mini split 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.