1/4" x 3/8" x 50 ft Mini Split Line Set

1/4" x 3/8" x 50 Ft Mini Split Line Set

The DABUND 1/4" x 3/8" x 50 ft mini split line set is a paired, pre-insulated copper refrigerant tubing set for compatible ductless air conditioners, heat pumps and HVACR systems. It combines a 1/4-inch liquid line and a 3/8-inch suction line in an approximately 15.24-meter coil, helping installers complete longer routes between indoor and outdoor units.

The seamless copper tubing is manufactured from C12200 phosphorus-deoxidized copper and is designed to meet ASTM B280 requirements for air-conditioning and refrigeration field service. Black closed-cell insulation helps limit unwanted heat transfer, reduce surface condensation and protect the copper tubing during handling and installation.

Compatibility notice: Before ordering, verify the required liquid-line diameter, suction-line diameter, copper wall thickness, insulation thickness, refrigerant, maximum permitted line length, vertical separation and additional refrigerant charge in the equipment manufacturer’s installation manual.

1/4 x 3/8 x 50 Ft Line Set Specifications

Key Features of the 50 Ft Mini Split Line Set

ASTM B280 copper tubing: C12200 DHP copper is designed for air-conditioning and refrigeration field service and provides the formability required for professional routing, cutting, flaring and brazing.

50-foot paired coil: The approximately 15.24-meter length supports installations where compatible indoor and outdoor units require a longer refrigerant route. Confirm the equipment’s maximum line length and additional charge requirement before installation.

Pre-insulated liquid and suction lines: Both tubes are insulated to reduce on-site preparation, help control condensation and limit unwanted thermal transfer.

Protected tube ends: Plastic caps help prevent dust, moisture and foreign material from entering the copper tubing during storage and transport.

OEM-ready supply: DABUND can customize copper tube combinations, wall thicknesses, insulation thicknesses, coil lengths, printed markings, cartons and private-label packaging.

Copper Tube and Black Insulation Construction

The product contains two seamless copper tubes supplied together as one coil. When specified by the connected equipment, the 1/4-inch tube serves as the liquid line and the 3/8-inch tube serves as the suction or gas line. The final piping arrangement must follow the equipment manufacturer’s installation instructions.

The closed-cell insulation functions as a thermal and moisture-resistant layer. Correctly sealing insulation joints, cut ends and outdoor sections helps maintain the vapor barrier, reduce condensation risk and protect system efficiency.

C12200 Copper Tubing

Black Closed-Cell Insulation

Protected Tube Ends

Black Closed-Cell Insulation Performance

Condensation control: The closed-cell structure helps reduce water-vapor transmission and surface condensation when insulation joints and exposed ends are sealed correctly.

Thermal protection: Insulation helps reduce heat transfer between the refrigerant tubing and the surrounding environment, supporting stable HVAC performance.

Mechanical protection: The insulation helps protect the soft copper tubing from abrasion and minor impact during transport, routing and installation.

UV-resistant options: Outdoor-grade insulation options are available. Confirm whether line-hide, protective tape, coating or an external jacket is required for the intended climate and local code.

Fire-performance options: Applicable insulation configurations may be supplied with documentation referencing ASTM E84, UL 94, ASTM D1056 or ASTM G21. Request the current report matching the exact material and thickness ordered.

Applications and Equipment Compatibility

A 1/4-inch liquid line paired with a 3/8-inch suction line is specified by selected ductless mini split and heat-pump models. It is not universally correct for every system with the same BTU or tonnage rating because piping requirements vary by brand, model, refrigerant, route length and vertical lift.

Use this 50 ft mini split line set only when the equipment manual permits both tube diameters and the full 50-foot route. Some systems require additional refrigerant beyond a specified factory-charge length, and maximum vertical separation limits may also apply.

Installation, cutting, flaring, brazing, nitrogen pressure testing, evacuation and refrigerant charging should be completed by qualified HVAC personnel according to the equipment instructions and local regulations.

Available Mini Split Line Set Sizes

DABUND supplies multiple paired copper tube combinations, coil lengths and insulation thicknesses for HVAC wholesalers, importers, installation-kit suppliers and private-label brands.

OEM Mini Split Line Set Manufacturer

DABUND has manufactured insulated copper pipe, mini split line sets and HVAC installation products since 2008. Wholesale buyers can specify tube dimensions, copper wall thickness, insulation material and thickness, coil length, printed identification, carton artwork and accessory combinations.

For an accurate quotation, provide the required liquid-line and suction-line outside diameters, copper wall thickness, insulation specification, coil length, refrigerant, working-pressure requirement, annual quantity, packaging design, certification requirement and destination port.

Why Choose DABUND?

HVAC manufacturing experience: DABUND has produced HVAC parts since 2008 and supplies insulated copper tubing and line sets for international distributors and installation markets.

In-house insulation capability: Multiple insulation materials, thicknesses and marking options can be configured for different climates, codes and market requirements.

Private-label supply: OEM buyers can request branded tubing, labels, cartons, manuals and customized installation-kit packaging.

Sample evaluation: Qualified buyers can request samples to check tube dimensions, insulation construction, markings and packaging before bulk production.

Quality Documents and Test Reports

The applicable certificate or test report depends on the exact copper tube and insulation configuration ordered. Buyers should request current documentation matching the selected copper wall thickness, insulation material, flame-performance grade and destination-market requirement.

Available documentation may reference ASTM B280 for copper tubing and ASTM E84, UL 94, ASTM D1056 or ASTM G21 for applicable insulation configurations. Final compliance must be confirmed against the exact product specification in the quotation and purchase order.

Meet DABUND at HVAC Exhibitions

DABUND participates in international HVAC exhibitions where importers, distributors and project buyers can inspect mini split line sets, insulated copper tubing and related air-conditioning installation products.

Frequently Asked Questions

What does 1/4 x 3/8 x 50 ft mean on a mini split line set?

It means the line set contains one 1/4-inch outside-diameter copper tube and one 3/8-inch outside-diameter copper tube, each supplied in a 50-foot coil. The metric outside diameters are approximately 6.35 mm and 9.52 mm.

Is a 1/4 x 3/8 line set suitable for every 9,000 or 12,000 BTU mini split?

No. Many systems use these dimensions, but piping requirements vary by manufacturer and model. Confirm the tube diameters, wall thickness, flare connection, permitted line length and refrigerant requirements in the installation manual.

Can I use the full 50 feet without adding refrigerant?

Not necessarily. Many systems are factory charged only for a specified line length. A longer route may require additional refrigerant calculated according to the equipment manufacturer’s instructions.

Why is ASTM B280 important for a refrigerant line set?

ASTM B280 specifies requirements for seamless copper tube intended for air-conditioning and refrigeration field service. It gives buyers a recognized basis for defining ACR copper tube material and dimensional quality.

What is the purpose of the black insulation?

The insulation reduces heat transfer, helps control condensation and protects the copper during transport and installation. Correctly sealing all joints and exposed ends is essential for maintaining the vapor barrier.

Is the line set compatible with R410A or R32?

Compatibility depends on copper wall thickness, pressure rating, fittings, cleanliness and the equipment specification. State the refrigerant and required working pressure when requesting a quotation so the appropriate configuration can be confirmed.

Are flare nuts or installation accessories included?

The standard package configuration should be confirmed in the quotation. DABUND can supply line sets alone or customize kits with flare nuts, communication cable, drain hose, wall sleeve, wrapping tape and other installation accessories.

Can DABUND customize copper wall thickness and insulation thickness?

Yes. Copper wall thickness and insulation thickness can be configured according to tube diameter, refrigerant pressure, condensation risk, climate, energy code and buyer specification.

Can I order OEM printing and private-label packaging?

Yes. DABUND supports OEM and ODM requirements including company names, size and length markings, labels, carton artwork, manuals and private-brand packaging.

Can I request a sample before a wholesale order?

Yes. Qualified buyers can request free samples, with express freight normally paid by the buyer. Specify the tube dimensions and insulation configuration required for evaluation.

What information is required for a quotation?

Provide the two tube outside diameters, copper wall thickness, coil length, insulation material and thickness, refrigerant, working pressure, certification requirements, order quantity, packaging design and destination port.

What are the usual payment and delivery terms?

Common payment options include T/T, L/C at sight and credit card, subject to order approval. Delivery terms can include EXW, FOB, CFR and CIF. Final terms should be confirmed in the formal quotation.

How long is the production lead time?

A typical lead time is approximately 15 to 20 days. The final schedule depends on order quantity, copper specification, insulation customization, packaging requirements and current production capacity.