1/4 LL × 3/8 SL × 50 ft HVAC Line Set – Pre-Insulated Copper Refrigerant Tubing

1/4" LL x 3/8" SL x 50 ft HVAC Line Set

The 1/4" LL x 3/8" SL x 50 ft HVAC line set is a pre-insulated copper refrigerant tubing solution designed for mini split air conditioners, ductless HVAC systems, heat pumps and split system installations with extended line runs.

This HVAC line set includes a 1/4" liquid line and a 3/8" suction line with factory-applied white PE insulation. It supports efficient refrigerant transfer, thermal protection, condensation control and cleaner installation between indoor and outdoor units.

Dabund supplies insulated copper tubing, mini split line sets and HVAC refrigerant lines for contractors, installers, wholesalers, distributors and private-label HVAC buyers.

Product Overview: High-Quality HVAC Copper Line Set

The 1/4" LL x 3/8" SL x 50 ft HVAC line set is built for reliable and energy-efficient refrigerant flow. It connects the indoor evaporator unit to the outdoor condenser unit in compatible mini split and split HVAC systems.

The 50 ft length gives installers more flexibility when the indoor and outdoor units are farther apart, such as multi-story homes, garages, large living spaces, attic routing and replacement HVAC projects.

Key Features of 1/4" LL x 3/8" SL x 50 ft HVAC Line Set

• 50 ft pre-insulated HVAC line set for mini split and ductless AC installation.

• 1/4" liquid line and 3/8" suction line for compatible HVAC systems.

• 99.9% pure copper tubing supports stable refrigerant transfer.

• Factory-applied white PE insulation helps reduce heat gain, heat loss and condensation.

• UV-resistant and weather-durable insulation jacket for indoor and outdoor line runs.

• Suitable for R410A, R32 and similar HVAC refrigerants when installed correctly.

• Continuous 50 ft line set reduces the need for extra couplings in longer routes.

• Designed for residential HVAC, light commercial projects and replacement line set work.

• OEM logo printing, insulation thickness and packaging customization are available.

Standard Refrigerant Line Sizes Explained

1/4" LL: Liquid Line

The 1/4" LL refers to the liquid line. In compatible HVAC systems, it carries liquid refrigerant from the outdoor condenser toward the indoor evaporator.

3/8" SL: Suction Line

The 3/8" SL refers to the suction line. It returns refrigerant vapor from the indoor evaporator back to the outdoor compressor.

50 ft Length for Flexible HVAC Installations

The 50 ft line set supports longer distances between indoor and outdoor units. It helps create cleaner routing with fewer couplings than shorter kits when the jobsite requires an extended refrigerant line run.

Factory-Applied Insulation for Thermal Protection

Excellent Thermal Efficiency

Factory insulation helps preserve refrigerant temperature along the full line set, reducing heat gain and heat loss that may reduce cooling or heating performance.

Condensation Prevention and Moisture Control

Pre-insulated tubing minimizes surface condensation, helping protect walls, framing, ceilings and nearby building materials from moisture stains and damage.

UV-Resistant and Weather-Durable Jacket

The white PE insulation jacket is designed for outdoor refrigerant pipe exposure between indoor and outdoor units, supporting performance in different climates and installation conditions.

Premium Copper Construction for HVAC Reliability

99.9% Pure Copper Tubing

The line set uses high-purity copper tubing designed for HVAC refrigerant transfer. Copper provides excellent thermal conductivity, corrosion resistance and long-term mechanical durability.

ASTM B280 and C12200 Copper Options

Dabund can supply copper tubing that meets ASTM B280 and C12200 standards for HVAC refrigerant line applications, supporting professional installation and export market requirements.

High-Pressure Rated for Modern Refrigerants

The copper tubing is designed for modern HVAC refrigerant systems such as R410A and R32 when installed according to the equipment manufacturer’s requirements and local HVAC codes.

HVAC Compatibility and Applications

This 50 ft HVAC line set is suitable for mini split air conditioners, ductless heat pump systems and split HVAC projects that require a 1/4" liquid line and 3/8" suction line.

• Mini split air conditioners.

• Ductless heat pump systems.

• Residential split HVAC installations.

• Apartment, garage and attic line set routing.

• Replacement and retrofit refrigerant line projects.

• Light commercial HVAC installations.

The line set is compatible with common HVAC refrigerants such as R410A, R32 and similar refrigerants when installed according to system specifications.

99.9% Pure Copper

White PE Insulated Pipe

Plastic Cap Protection

Pipe Insulation Tubing Structure

The white PE insulation structure is designed to protect the copper refrigerant tubing from heat transfer, moisture condensation, outdoor exposure and normal installation wear.

Embossed White PE Outer Layer

The outer insulation layer helps resist aging, abrasion and sunlight exposure while keeping the line set clean and professional after installation.

Closed-Cell Foam Insulation

Closed-cell insulation helps reduce heat exchange and surface condensation, supporting consistent refrigerant temperature and system efficiency.

Inner Protective Layer

The inner insulation layer helps protect the copper tubing surface and maintain full insulation coverage across the 50 ft run.

Thermal Insulation Pipe Production

Insulation Pipe Warehouse

Inner Layer Insulated Pipe

Key Benefits of This HVAC Line Set

Saves Time with Ready-to-Install Tubing

Factory-insulated copper lines eliminate most separate insulation wrapping, helping installers save time and maintain consistent insulation quality.

Reduces Thermal Loss and Improves System Efficiency

Stable refrigerant temperature along the line set helps the HVAC system operate more efficiently and reduces unnecessary energy loss.

Minimal Condensation for Cleaner Installations

Insulated tubing helps reduce condensation dripping that can stain ceilings, walls and building structures, especially in humid environments.

Technical Specifications

Installation Tips for Best Results

Measure the Line Path Before Starting

Confirm the total distance between indoor and outdoor units to make sure the 50 ft line set provides a clean route with gradual bends and minimal stress points.

Protect Insulation at Wall Penetrations

Use wall sleeves, grommets or protective covers where the line set passes through walls or structures to prevent insulation abrasion.

Secure Tubing with Professional Supports

Install clips, straps or HVAC brackets along the run to reduce sagging, vibration and long-term movement.

Follow Equipment Manufacturer Requirements

Always confirm line size, maximum line length, flare connection method and refrigerant charging requirements with the HVAC equipment manufacturer.

HVAC Line Set Size Options

Recommended Applications by AC Capacity

The 1/4" LL x 3/8" SL line set is commonly used for 0.75 ton to 1.0 ton mini split systems and many 9,000 BTU to 12,000 BTU applications. Final sizing should always follow the equipment manufacturer’s requirements.

Why Choose This 50 ft HVAC Line Set?

Reliable Materials and Professional-Grade Build

With 99.9% pure copper and durable insulation, this line set is built for long service life, efficient performance and fewer HVAC service callbacks.

Ready-to-Install and Time-Saving

The factory-insulated, pre-sized line set arrives ready for faster installation, helping HVAC professionals reduce jobsite labor and improve installation consistency.

Ideal for Residential and Light Commercial Projects

This 50 ft HVAC line set is suitable for homes, apartments, offices, garages and light commercial applications where longer refrigerant line runs are required.

OEM and Bulk Supply Available

Dabund supports OEM branding, custom insulation thickness, private-label packaging and bulk production for HVAC wholesalers, distributors and importers.

Dabund Factory

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

SGS Certificate

Mini split line set insulation can be made of polypropylene or black rubber with UV resistance, meeting ASTM E84, UL94, ASTM D1056 and ASTM G21 requirements.

Exhibition

Dabund joins HVAC exhibitions worldwide to present mini split line set and HVAC installation products to customers face to face.

FAQ

What does 1/4" LL x 3/8" SL mean?

It refers to the outer diameters of the two copper refrigerant tubes. 1/4" LL means 1/4" liquid line, and 3/8" SL means 3/8" suction line.

What is this 50 ft HVAC line set used for?

It is used to connect indoor and outdoor units in mini split air conditioners, ductless heat pumps and split HVAC systems that require a 1/4" liquid line and 3/8" suction line.

What AC capacity is 1/4" x 3/8" commonly used for?

This line set size is commonly used for 0.75 ton to 1.0 ton mini split systems and many 9,000 BTU to 12,000 BTU applications.

Do I need to add more insulation on site?

In most standard HVAC installations, no additional insulation is required because the tubing comes with factory-applied insulation. Local codes or harsh environments may require extra protection.

Is this suitable for outdoor HVAC line runs?

Yes. The UV-resistant and weather-durable insulation jacket is suitable for exterior refrigerant pipe exposure when installed correctly.

Is this compatible with R410A and R32 mini split systems?

Yes. This HVAC line set supports commonly used refrigerants such as R410A and R32 when installed according to manufacturer and local code requirements.

Can this 50 ft line set be shortened?

Yes. The copper tubing can be cut to the required length, but proper cutting, deburring, flaring and sealing are required to maintain refrigerant system integrity.

Can Dabund provide other line set sizes?

Yes. Dabund can provide multiple HVAC line set sizes and lengths, including 15 m, 20 m, 25 m, 30 m and 50 m, with different insulation thickness options.

Are you a trading company or manufacturer?

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

Can I get a free sample?

Yes. Dabund can provide qualified customers with 3 pieces of free samples. Express cost may need to be covered by the buyer. You can request samples through the free sample page.

Can I print my logo?

Yes. Dabund accepts OEM and ODM orders, including logo printing, brand marking and customized packaging.

What payment terms are available?

Payment terms may include T/T, L/C at sight, credit card and other agreed payment methods depending on order details.

What delivery terms can you offer?

Dabund can offer common international trade terms such as EXW, FOB, CFR and CIF.

How long is your delivery time?

Normal delivery time is usually 15 to 20 days. For urgent orders, production and shipment can be arranged according to factory schedule.