Mueller AC Mini Split Line Set - 1/4" x 1/2" Tubing, 1/2" x 1/2" Insulation, 50 Ft Refrigerant Line, Black Finish, Domestic (MPN: 40820500B6C)

Upgrade Your HVAC System with Our Premium Mini Split Line Set

When it comes to ensuring optimal performance in your heat pump and air conditioning system, our Streamline® copper refrigerant line set is the premium choice that professionals trust. Designed for durability and efficiency, this mini-split line set is crafted from high-quality UNS C12200 copper tube, ensuring it meets the rigorous demands of both residential and commercial HVAC applications.

With its nitrogen-purged design and pre-insulated ACR construction, this copper line set guarantees optimal cleanliness and liquid refrigerant flow — while the 1/2" closed-cell insulation maintains temperature integrity as gaseous refrigerant travels back through the suction line to the compressor. UL Recognized to 700 PSI maximum design pressure and compatible with R410A and R32, this line set is engineered to handle the demands of modern mini-split systems in any climate condition.

Whether you're a professional contractor or a DIY homeowner, this kink resistant, cost-efficient line set simplifies your installation process — connecting your indoor evaporator unit to your outdoor condenser unit with reliable, leak-free performance across the full 50 ft run.

Why Choose Our Premium Copper Tubing Line Set?

• ✅ Durable Construction – Made from high-quality UNS C12200 copper, ensuring long-lasting performance for heat pump applications.
• ✅ Nitrogen-Purged – Guarantees optimal cleanliness, meeting ASTM B280 standards for high-pressure refrigerant systems.
• ✅ Flexible Design – Allows for easier installation, even in challenging environments and tight spaces.
• ✅ Corrosion-Resistant – Built to withstand the toughest conditions, ensuring durability in all climates.
• ✅ Compatible with Multiple Refrigerants – Works seamlessly with R-32 and R-410A refrigerants for modern air conditioning units.
• ✅ Leak-Proof Construction – Minimizes refrigerant loss, maintaining optimal efficiency in your heat system.
• ✅ Industry Compliance – Complies with strict safety and performance standards for plumbing and HVAC applications.
• ✅ Versatile Applications – Ideal for both residential and commercial HVAC, heat pump, and mini split systems.

Understanding AC Unit Line Set Applications

Our mini-split flexible copper line set serves as the vital connection between your outdoor condenser unit and indoor evaporator unit, carrying liquid refrigerant and gaseous refrigerant to ensure efficient heat transfer throughout your HVAC system.

This refrigerant line is essential for proper HVAC operation, whether you're installing a new heat pump system or replacing existing copper tube in your air conditioning setup. With a 1/4" liquid line and 1/2" suction line configuration, this mini-split line set is precisely sized to deliver optimal refrigerant flow rates and pressure balance for efficient system performance.

The liquid line carries high-pressure liquid refrigerant from the outdoor condenser unit to the indoor evaporator unit, while the suction line returns low-pressure gaseous refrigerant back to the compressor. The 1/2" closed-cell insulation wrapping both lines maintains refrigerant temperature integrity throughout this cycle — preventing energy loss and condensation buildup regardless of outdoor conditions.

This continuous refrigerant charging cycle, supported by UL Recognized copper tubing rated to 700 PSI maximum design pressure and compatible with both R410A and R32, is what makes your mini-split heat and air conditioning system function efficiently and reliably over the long term

Installation Complexity and Professional Considerations

While our Streamline® copper line set is designed for kink resistant flexibility and ease of routing — whether through walls, ceilings, or tight spaces between your indoor evaporator unit and outdoor condenser unit — we recommend professional installation to ensure optimal performance and compliance with local HVAC codes.

This mini-split line set may require specialized knowledge of refrigerant line handling, connections, and working temperature ranges, making it best suited for licensed plumbers or HVAC professionals familiar with R410A and R32 systems. Proper handling of the 1/4" liquid line and 1/2" suction line during installation is critical to maintaining the integrity of the pre-insulated ACR construction and ensuring leak-free liquid refrigerant and gaseous refrigerant flow from day one.

However, if you're a DIY enthusiast working on your heat pump or air conditioning project, this cost-efficient, pre-insulated copper tube is engineered to simplify the process — with the pipe marked every foot for accurate measuring and cutting during your installation run.

Remember that working with refrigerant charging and pressurized systems rated to 700 PSI maximum design pressure requires careful attention to safety, environmental regulations, and the warranty conditions outlined by Mueller Streamline to protect your investment.

What Pros & DIYers Need to Know About AC lineset

For Professional Contractors:This Streamline® copper tube line set meets the high demands of job sites, offering the durability, UL Recognized compliance, and 700 PSI maximum design pressure rating that HVAC professionals rely on. Its kink resistant construction and pre-insulated ACR design save installation time, while compatibility with R410A and R32 ensures broad application coverage across modern mini-split and heat pump systems.

The pipe marked every foot feature allows for precise measuring and clean cuts on the job site, while the 1/4" liquid line and 1/2" suction line configuration delivers consistent liquid refrigerant and gaseous refrigerant flow — reducing the risk of pressure imbalances and system failures from the first charge. Backed by a 10-year limited warranty on the copper tube and a 5-year limited warranty on the Duraguard UV™ insulation from Mueller Streamline, this copper refrigerant line set is a smart, cost-efficient choice for any air conditioning or heat pump project.

For DIY Homeowners:If you're looking to connect your indoor evaporator unit to your outdoor condenser unit on your mini-split or heat pump system, this pre-insulated AC lineset is a reliable, cost-efficient option built to professional standards. The kink resistant copper tube handles routing through tight spaces with ease, and the factory-applied 1/2" closed-cell insulation eliminates the need for separate pipe insulation — saving time and reducing installation steps.

Just remember to follow refrigerant charging guidelines carefully and adhere to local HVAC codes. Even if you're confident in your skills, professional installation is always the safest bet for ensuring your connections between the outdoor condenser unit and indoor evaporator unit run smoothly — and for keeping your warranty intact.

Advanced Features That Stand Out in HVAC Applications

✅ High-Grade UNS C12200 Copper Tube — Manufactured to ASTM B280 standards, ensuring reliable, consistent performance across mini-split, heat pump, and air conditioning applications.

✅ Flexible Copper Design — Makes routing easier through tight spaces between your indoor evaporator unit and outdoor condenser unit, without compromising refrigerant line integrity.

✅ Superior Corrosion Resistance — Built to last in demanding environments with consistent liquid refrigerant and gaseous refrigerant exposure across the full 50 ft run.

✅ Nitrogen-Purged for Leak-Free Performance — Factory nitrogen-purged to maintain internal cleanliness, minimizing contamination risk and ensuring optimal refrigerant charging from the first install.

✅ R410A and R32 Compatible — Works with R410A, R32, and other synthetic refrigerants, providing broad compatibility across modern mini-split and heat pump systems.

✅ Mueller Streamline® Quality — UL Recognized to 700 PSI maximum design pressure, backed by a 10-year limited warranty on the copper tube and a 5-year limited warranty on the Duraguard UV™ insulation, and made in USA.

✅ Pre-Insulated ACR with Closed-Cell Insulation — 1/2" closed-cell Duraguard UV™ insulation engineered for efficient liquid refrigerant circulation and temperature integrity throughout the HVAC system.

Benefits for Your Heat Pump and Air Conditioning System

Installing our premium copper line set provides numerous advantages for your HVAC system.

The high-quality copper tubing ensures excellent heat transfer efficiency, while the nitrogen-purged design prevents contamination that could affect refrigerant performance.

This HVAC line set is specifically engineered to handle the demands of modern heat pump and air conditioning applications.

The corrosion-resistant properties of our copper tubing ensure long-term reliability, reducing maintenance costs and extending the life of your air distribution system.

Whether you're connecting a new heat system or replacing existing lines, this product delivers the performance professionals expect from quality plumbing supplies.

Why Plumbing Supply and More is Your Trusted Source

At Plumbing Supply and More, we understand the critical role that quality HVAC line sets play in overall system performance. Our commitment to providing premium plumbing and heating supplies means you can trust our Streamline® mini-split line sets for your most demanding residential and commercial projects — stocking only Mueller Streamline copper tubing that meets or exceeds ASTM B280 industry standards at a cost-efficient price point.

Our knowledgeable team can help you select the right copper refrigerant line set for your specific heat pump or air conditioning application — ensuring you get the proper liquid line and suction line configuration, correct insulation thickness, custom lengths, custom ends, and compatible connections for optimal refrigerant line flow and system efficiency.

Don't compromise on quality when it comes to your mini-split or heat pump system. Invest in our Duraguard UV™ pre-insulated ACR copper line set today — UL Recognized, R410A and R32 compatible, backed by a 10-year limited warranty on the copper tube and 5-year limited warranty on the Duraguard UV™ insulation, and made in USA by Mueller Streamline.

With trusted materials, expert design, and our commitment to delivering cost-efficient quality HVAC supplies, you can be confident in your choice for both professional contractors and DIY projects alike