3/8" x 7/8" Mini Split Line Set

3/8" x 7/8" Mini Split Line Set for HVAC and Refrigeration Systems

The DABUND 3/8" x 7/8" mini split line set is a professional HVAC copper line set designed for ductless mini split systems, heat pumps, central air conditioning units, VRF systems, and refrigeration applications. It includes two high-purity copper pipes with factory-applied black rubber insulation for stable refrigerant flow, thermal protection, and long-term durability.

DABUND has produced HVAC parts and mini split line sets since 2008. This 3/8" x 7/8" AC copper line set is made with copper tubing that can meet ASTM B280 and C12200 standards according to product specification. The black rubber insulation supports UV resistance, flame resistance, condensation protection, and a working temperature range up to 120°C.

Key Features of 3/8" x 7/8" Mini Split Line Set

This mini split line set is designed for high-capacity HVAC applications where refrigerant flow stability, pressure resistance, insulation durability, and installation efficiency are important.

• Copper size: 3/8" x 7/8" outer diameter / 9.52 mm x 22.22 mm

• Copper material: 99.9% pure copper pipe

• Copper standard: ASTM B280 and C12200 according to product specification

• Insulation: black rubber insulation with UV resistance

• Working temperature: -40°C to 120°C

• Pressure rating: 2100 to 7000 PSI according to specification

• Applications: ductless mini split, heat pump, central air conditioning, VRF, and refrigeration systems

Product Specifications

Copper Tube: ASTM B280 and C12200 DHP

The copper tubing is designed for air conditioning and refrigeration applications. High-purity C12200 DHP copper provides excellent thermal conductivity, stable refrigerant transmission, corrosion resistance, and long service life in HVAC systems.

• Excellent heat transfer performance for HVAC refrigerant lines

• Strong corrosion resistance for long-term system reliability

• Suitable for high-pressure refrigerants when specifications match

• Used for ductless mini split, heat pump, VRF, and central air conditioning systems

Black Rubber Insulation for Thermal and Moisture Protection

The mini split line set uses black rubber insulation designed for thermal protection, condensation resistance, UV exposure, and outdoor durability. The insulation material can function as both the thermal insulation layer and moisture-proof layer.

High-Density Closed-Cell Insulation

The closed-cell structure helps reduce water vapor penetration, prevents condensation, and maintains stable refrigerant temperature during cooling and heating operation.

Flame Resistance and UV Resistance

The insulation can meet UL94, ASTM E84, ASTM D1056, and ASTM G21 requirements according to selected material. It supports superior tear resistance, UV resistance, and stable performance in demanding installation environments.

Temperature Range from -40°C to 120°C

The insulation is suitable for HVAC installations exposed to low and high temperatures. It helps protect the copper line set from environmental stress and supports long-term reliability.

99.9% Pure Copper

Black Rubber Insulated Pipe

Plastic Cap Protection

Features of Pipe Insulation Tubing

The black rubber pipe insulation is designed to protect the copper tubing from heat transfer, moisture condensation, UV exposure, and mechanical wear. It helps keep the installation clean while protecting the copper pipe in long-term HVAC operation.

• Material option: black rubber insulation

• Temperature range: -40°C to 120°C

• Improved moisture condensation resistance

• Thermal insulation and moisture-proof function in one structure

• Tear resistance, UV resistance, and corrosion-related protection

3/8" x 7/8" Mini Split Line Set for HVACR Applications

DABUND in-house tested insulated copper pipe and tubing is designed to make HVAC installation simple and efficient. The pre-insulated roll format helps save time and labor on each job, especially for contractors and project installers.

Excellent Heat Preservation Insulation

The high-density closed-cell insulation helps reduce thermal conductivity and maintain stable refrigerant temperature, even when the external environment changes.

Eco-Friendly and Durable Material

The insulation material is designed for low odor, corrosion resistance, acid and alkali resistance, and long service life. It also helps reduce mold growth and external damage risk.

Flame-Retardant Insulation Performance

The insulation material supports flame-retardant performance and can be used across a working temperature range from -40°C to 120°C according to selected specification.

Moisture Condensation Control

The insulation layer helps block moisture condensation, reducing the need for an additional water vapor permeation protective layer in many HVAC applications.

Mini Split Line Set Size Options

Line Set Size and HVAC Capacity Reference

Why Choose 3/8" x 7/8" Mini Split Line Set from DABUND?

DABUND has manufactured mini split line sets since 2008 and has long-term experience in production, insulation processing, OEM customization, export packaging, and international shipment. DABUND provides individual pre-insulated rolls for ductless mini splits, VRF systems, heat pumps, and unitary systems.

• Mini split line set manufacturer since 2008

• In-house insulation production and line set assembly

• OEM printing for company name, size, meters, and private label branding

• Experience in producing and exporting HVAC copper line sets

• Long-term freight forwarder cooperation for stable shipment

• Competitive factory pricing with professional service support

DABUND Factory

We produce insulated copper pipe, mini split line set, aluminum pipe, and HVAC parts for global HVAC customers.

SGS Certificate

DABUND mini split line set insulation can be made of polypropylene or black rubber with UV resistance and can meet ASTM E84, UL94, ASTM D1056, and ASTM G21 standards according to product specification.

Exhibition

DABUND joins HVAC exhibitions worldwide to help customers evaluate mini split line sets, insulated copper pipes, HVAC line sets, and HVAC parts face to face.

FAQ

What is a 3/8" x 7/8" mini split line set used for?

A 3/8" x 7/8" mini split line set is used to connect indoor and outdoor HVAC units, allowing refrigerant to circulate between the evaporator and condenser. It is commonly used for higher-capacity mini split, heat pump, central AC, VRF, and refrigeration systems.

What HVAC system capacity commonly uses 3/8" x 7/8" line sets?

The 3/8" x 7/8" line set is commonly used for 6.0–8.0 ton or 72,000–96,000 BTU ductless mini split and high-capacity HVAC systems. Final selection should follow the equipment manufacturer’s installation manual.

Is this line set compatible with R410A refrigerant?

Yes. The copper pipe can support high-pressure refrigerants such as R410A when the copper size, wall thickness, pressure rating, line length, and HVAC equipment requirements match.

What standards can the copper tube meet?

The copper tube can meet ASTM B280 and C12200 requirements according to product specification. These standards are commonly used for HVAC and refrigeration copper tubing.

What insulation material is used on this mini split line set?

The line set uses black rubber or high-density closed-cell polyethylene foam insulation according to selected specification. It provides thermal insulation, moisture condensation resistance, UV resistance, and outdoor durability.

Can DABUND print my company name or logo on the insulation?

Yes. DABUND supports OEM printing, including company name, pipe size, length, meters, logo, and private label packaging for distributors and HVAC brands.

What are your payment terms?

Payment terms can include TT, L/C at sight, credit card, and other agreed payment methods depending on order details and customer requirements.

What are your delivery terms?

Delivery terms can include EXW, FOB, CFR, CIF, and other international trade terms according to buyer logistics requirements.

Are you a trading company or manufacturer?

DABUND is a manufacturer of mini split line sets, insulated copper pipes, aluminum pipes, and HVAC parts.

Can I get a sample before bulk order?

Yes. DABUND can send 3 pieces of free samples. The buyer only needs to cover the express cost.

How long is your delivery time?

Normal delivery time is usually 15–20 days. For urgent orders, DABUND can arrange production and delivery in advance when capacity allows.