1/4" x 3/8" x 50 ft Refrigeration Copper Pipe

50 Ft 1/4" x 3/8" Refrigeration Copper Pipe

DABUND 50 ft 1/4" x 3/8" refrigeration copper pipe is a pre-insulated twin refrigerant line set for compatible mini split air conditioners, heat pumps, split AC systems and refrigeration applications.

The paired copper tubing combines 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 50 ft, approximately 15.24 m.

On compatible HVAC equipment, the 1/4" tube commonly serves as the liquid line while the 3/8" tube serves as the suction or gas line. Exact refrigerant pipe dimensions must always be verified against the installation manual for the equipment being installed.

High-purity copper tubing is combined with factory-applied black rubber insulation to provide 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 50 ft / 15.24 m insulated refrigeration copper line set containing 1/4" and 3/8" tubing, approximately 6.35 mm and 9.52 mm OD, with black rubber insulation for compatible HVAC and refrigeration systems.

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

50 Ft 1/4" x 3/8" Copper Pipe Specifications

Key Features of the 1/4" x 3/8" Refrigeration Line Set

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

On compatible air-conditioning and refrigeration equipment, the smaller 1/4" copper tube commonly functions as the liquid line while the larger 3/8" tube functions as the suction or gas return line.

Their approximate outside diameters are 6.35 mm and 9.52 mm. Because different HVAC models can require different refrigerant tubing dimensions, both pipe sizes should be verified before ordering or installation.

50 Ft Continuous Copper Refrigerant Line

The 50 ft / 15.24 m continuous coil provides additional routing flexibility for projects where the indoor and outdoor equipment cannot be connected with a short refrigerant line set.

Where permitted by the equipment manufacturer, using one continuous coil can reduce intermediate refrigerant-line connections compared with joining multiple shorter copper sections.

C12200 DHP Copper for HVAC and Refrigeration

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

ASTM B280 and C12200 DHP specifications are available according to the ordered product configuration. Buyers requiring a specific tube wall thickness or working-pressure value should confirm the applicable technical specification before production.

Factory-Applied Black Rubber Insulation

Factory-applied black rubber insulation helps reduce field preparation while providing thermal protection and condensation control around the copper refrigerant tubing.

Multiple Insulation Thickness Options

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

OEM Printing and Private Label Supply

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

High-Purity Copper

Black Rubber Insulation

Protective Plastic Caps

Black Rubber Insulation for Refrigeration 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 field routing

• UV-resistant configurations available

• Multiple insulation thicknesses available

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

Thermal Insulation

The closed-cell structure helps reduce heat transfer between refrigerant tubing and surrounding air, supporting stable operating conditions when the system is correctly designed and installed.

Condensation Control

Black rubber insulation helps limit water-vapor penetration and surface condensation. Properly sealing insulation joints is especially important in warm and humid environments.

Flexible Routing

Flexible insulation makes it easier to route the paired copper tubing through walls, ceilings and service spaces while helping protect the copper surface during installation.

UV-Resistant Options

UV-resistant insulation configurations are available where part of the refrigerant piping is installed outdoors. Additional line-set covers may be required depending on environmental exposure and project conditions.

Insulation Testing Options

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

Why Choose a 50 Ft 1/4" x 3/8" Copper Line Set?

The 50 ft length provides additional routing flexibility for compatible air-conditioning and refrigeration installations where common short line sets do not provide sufficient distance.

Typical routing may pass through walls, ceilings, attics, service areas or other building spaces before reaching the outdoor condensing unit.

Where the equipment permits a 50 ft refrigerant route, one continuous coil can help reduce intermediate connections compared with joining several shorter tubing sections.

Installation Considerations for a 50 Ft Refrigerant Line

Verify the Required Copper Tube Sizes

Confirm that the equipment requires 1/4" and 3/8" outside-diameter refrigerant tubing. Similar-capacity air-conditioning systems can use different pipe dimensions.

Check Maximum Actual Piping Length

Confirm that the equipment manufacturer permits the required 50 ft / 15.24 m refrigerant route. Do not assume that every mini split or refrigeration system allows the same maximum piping length.

Check Equivalent Line Length

Bends and routing conditions can affect equivalent refrigerant piping length. Follow the equipment manufacturer's method for evaluating total line length where applicable.

Confirm Vertical Separation

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

Check Additional Refrigerant Requirements

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

Support and Protect the Copper Line

Long horizontal and vertical tubing sections should be properly supported to reduce sagging, vibration and mechanical stress. Wall penetrations should also be protected to prevent damage to the insulation.

Is 1/4" x 3/8" Suitable for My HVAC System?

The 1/4" x 3/8" tube combination is commonly found on selected smaller-capacity mini split and air-conditioning systems. Some equipment around 9,000–12,000 BTU may use these dimensions.

However, BTU capacity or tonnage alone should not be used to select refrigerant piping. Equipment manufacturers may specify different line sizes for systems with similar nominal capacity.

Always use the installation manual or technical data for the exact indoor and outdoor equipment combination as the final reference.

Applications of 50 Ft 1/4" x 3/8" Copper Pipe

Ductless Mini Split Systems

Suitable for compatible ductless mini split systems that specifically require 1/4" and 3/8" refrigerant tubing.

Heat Pump Systems

Can be supplied for compatible heat pumps requiring this paired refrigerant line size and suitable insulation.

Residential Air Conditioning

The 50 ft coil provides additional routing distance for compatible residential installations where indoor and outdoor units are positioned farther apart.

Refrigeration Applications

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

Available Refrigeration Copper Pipe Sizes

Refrigeration Copper Pipe for Distributors and Wholesalers

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

The 50 ft 1/4" x 3/8" configuration provides a stocking option for buyers serving compatible smaller-capacity mini split, air-conditioning and refrigeration installations.

OEM and Custom Refrigeration Copper Pipe Supply

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

• Custom copper tube combinations

• Custom coil lengths

• Multiple black rubber insulation thicknesses

• Logo and specification printing

• Private-label packaging

• Custom product identification

• Bulk supply for distributors and project buyers

Why Choose DABUND Refrigeration Copper Pipe?

HVAC Manufacturing Experience Since 2008

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

Multiple Sizes and Coil Lengths

Multiple paired copper tube sizes, lengths and insulation thicknesses allow distributors to source different HVAC and refrigeration piping configurations from one supplier.

OEM and Private-Label Support

Insulation printing, product identification and packaging can be customized according to distributor, wholesaler and brand requirements.

DABUND Factory and Export Packaging

DABUND manufactures and packages insulated copper line sets and refrigeration copper tubing 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 the applicable documentation for the exact insulation being ordered.

International HVAC Exhibitions

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

Frequently Asked Questions

What is a 50 ft 1/4" x 3/8" refrigeration copper line set?

It is a paired refrigerant copper line set containing 1/4" and 3/8" outside-diameter 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 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 equipment, the 1/4" tube commonly serves as the liquid line and the 3/8" tube as the suction or gas line. Always confirm the piping specification for the exact equipment model.

What HVAC capacity uses a 1/4" x 3/8" line set?

Some smaller-capacity systems around 9,000–12,000 BTU may use this tube combination, but this is not universal. Similar-capacity equipment can require different pipe dimensions.

Can I select the copper pipe by BTU or tonnage alone?

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

Why choose a 50 ft refrigerant line?

A 50 ft line provides additional routing distance for installations where shorter copper tubing is insufficient and may reduce intermediate joints when the equipment permits a continuous 50 ft run.

Can every mini split use a 50 ft line set?

No. Maximum actual and equivalent refrigerant piping lengths vary by manufacturer and model. Check the equipment documentation before installation.

Does a 50 ft installation require additional refrigerant?

It may. Some systems include a factory charge for only a specified standard line length. Follow the equipment manufacturer's charging instructions for the exact model.

What insulation is used on this refrigeration copper pipe?

This 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 thicknesses include 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm depending on the selected specification.

Is UV-resistant insulation available?

Yes. UV-resistant insulation configurations are available where portions of the refrigerant piping are installed outdoors.

What pressure rating does the copper pipe have?

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

Can DABUND customize the refrigeration copper pipe?

Yes. OEM and ODM options include 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 the express shipping cost.

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?

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 quantity, specification, customization and production schedule.

Who should install the refrigeration copper line set?

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