1/4 3/8 Line Set 50 Feet Long

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

The DABUND 50 ft 1/4" x 3/8" mini split line set is a pre-insulated copper tubing pair designed to connect the indoor and outdoor units of compatible ductless air conditioners, heat pumps and HVACR systems. The set includes a 1/4-inch liquid line and a 3/8-inch suction line, supplied in a 50-foot coil for longer installation routes.

The copper tubing is manufactured from C12200 phosphorus-deoxidized copper and is designed to meet ASTM B280 requirements for air-conditioning and refrigeration field service. Closed-cell insulation helps reduce heat gain, control condensation and protect the refrigerant tubing during installation and operation.

Important compatibility note: Before ordering, verify the required liquid-line diameter, suction-line diameter, copper wall thickness, insulation thickness, refrigerant type and maximum permitted line length in the air-conditioner or heat-pump installation manual.

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

Key Features of the 1/4 x 3/8 Mini Split Line Set

ASTM B280 copper tubing: The refrigerant lines use C12200 DHP copper intended for air-conditioning and refrigeration applications, providing good formability for professional routing, flaring and brazing.

50-foot installation length: The approximately 15.24-meter coil supports installations where the indoor and outdoor units are separated by a longer route. Always confirm the equipment manufacturer's maximum line length and additional refrigerant-charge requirements.

Pre-insulated liquid and suction lines: Both copper tubes are insulated to help limit thermal transfer and condensation while reducing on-site insulation work.

Protected tube ends: Plastic caps help keep dust, moisture and foreign material out of the copper tubing before installation.

Flexible OEM supply: DABUND can customize tube sizes, copper wall thicknesses, insulation thicknesses, roll lengths, printed markings, cartons and private-label packaging for HVAC distributors and installation-kit brands.

Copper Tube and Insulation Construction

The 1/4-inch and 3/8-inch copper tubes are supplied as a paired coil for easier storage, transport and installation. The copper is suitable for field flaring or brazing according to the HVAC equipment manufacturer's instructions and applicable installation standards.

The closed-cell insulation acts as both a thermal layer and a moisture-resistant layer. Correctly sealed insulation joints help maintain the vapor barrier, reduce surface condensation and protect system efficiency. Outdoor portions should be installed and protected in accordance with local codes and the selected insulation specification.

C12200 Copper Tubing

Closed-Cell Insulation

Protected Tube Ends

Insulation Performance

Condensation control: The closed-cell structure helps reduce water-vapor transmission and surface condensation when the insulation is installed with continuous, properly sealed joints.

Thermal protection: The insulation helps reduce unwanted heat transfer between the refrigerant tubing and the surrounding environment.

UV-resistant options: Insulation constructions for outdoor HVAC installations are available. Confirm whether additional line-hide protection, coating or jacketing is required for the intended climate and local installation code.

Fire-performance options: Insulation materials can be supplied according to project requirements, including applicable ASTM E84, UL 94, ASTM D1056 and ASTM G21 test specifications. Request the matching test report for the exact insulation configuration ordered.

Applications and Equipment Compatibility

A 1/4-inch liquid line paired with a 3/8-inch suction line is used by selected ductless mini split and heat-pump models. However, equipment capacity alone does not determine the correct tubing size. Different brands and models can require different suction-line diameters, wall thicknesses, flare connections, maximum vertical separation and refrigerant adjustments.

Use this 50 ft line set only when the equipment installation manual specifies a 1/4-inch liquid line and a 3/8-inch suction line and permits a 50-foot route. Installation, pressure testing, evacuation, charging, flaring and brazing should be completed by qualified HVAC personnel in accordance with the equipment instructions and local regulations.

Available Mini Split Line Set Sizes

In addition to the 50 ft 1/4 x 3/8 line set, DABUND supplies multiple copper-tube combinations, coil lengths and insulation thicknesses for wholesalers, HVAC installation-kit suppliers and private-label brands.

OEM 50 Ft Copper Line Sets for HVAC Distributors

DABUND manufactures insulated copper pipe, mini split line sets, aluminum pipe and HVAC installation accessories. Wholesale buyers can request private-label printing, customized cartons, tube-size combinations, insulation specifications and coil lengths for their target markets.

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

Why Choose DABUND as Your Line Set Manufacturer?

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

In-house customization: Copper dimensions, insulation, printed identification and packaging can be configured for distributors, contractors, equipment brands and installation-kit suppliers.

Sample support: Qualified buyers can request product samples to evaluate dimensions, insulation construction, marking 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 the current documentation that corresponds to their selected wall thickness, insulation material, flame-performance requirement and destination-market standard.

Available documentation may include copper-material specifications and insulation test reports referencing ASTM B280, C12200, ASTM E84, UL 94, ASTM D1056 and ASTM G21, where applicable to the ordered product.

Meet DABUND at HVAC Exhibitions

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

Frequently Asked Questions

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

The measurements refer to the outside diameters of the two refrigerant tubes. This line set includes a 1/4-inch liquid line and a 3/8-inch suction line, equivalent to approximately 6.35 mm and 9.52 mm outside diameter.

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 line-set sizing varies by manufacturer and model. Always confirm the required tube diameters, wall thickness, flare size and permitted line length in the equipment installation manual.

Can I use the full 50 feet of copper tubing?

Only when the HVAC equipment permits a 50-foot refrigerant route. Some systems require additional refrigerant beyond a specified factory-charge length, and maximum vertical separation may also apply.

Does the 50 ft line set include flare nuts or installation accessories?

The standard supply configuration should be confirmed when requesting a quotation. DABUND can provide copper line sets alone or develop customized installation kits with specified fittings, cable, drain hose, wall sleeve, wrapping tape and other accessories.

Is the copper tubing compatible with R410A or R32 systems?

Compatibility depends on the copper wall thickness, pressure rating, tube dimensions, fittings and equipment requirements. Provide the refrigerant and operating-pressure specification so DABUND can recommend and document the appropriate configuration.

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 helps buyers define the material, dimensions and quality requirements for HVACR copper tubing.

Can DABUND customize the insulation thickness?

Yes. Available options include 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm. The suitable thickness depends on the tube diameter, ambient conditions, condensation risk, energy code and project specification.

Can I order custom printing and private-label packaging?

Yes. DABUND supports OEM and ODM requirements, including company names, tube sizes, length markings, carton artwork, labels and other private-brand packaging details.

Can I request a sample before placing a bulk order?

Yes. Qualified buyers can request free samples, with express freight normally paid by the buyer. Confirm the required dimensions and insulation specification before shipment.

What information is needed for a wholesale quotation?

Provide the liquid-line and suction-line outside diameters, copper wall thickness, coil length, insulation material and thickness, refrigerant, working pressure, required certificates, packaging, order quantity and destination port.

What payment and delivery terms are available?

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. Confirm the final commercial terms in the quotation.

How long is the production lead time?

A typical lead time is approximately 15 to 20 days, but the final schedule depends on order quantity, customization, raw-material availability, packaging and production capacity at the time of order.