The Ultimate Guide to Choosing the Right Flaring Tool for Mini-Split Installation

When it comes to installing a mini-split system, having the right flaring tool is crucial. A flaring tool is used to create a flared end on the copper tubing, which allows for a proper connection to the mini-split system. This comprehensive guide will provide you with all the technical details and expert insights you need to choose the best flaring tool for your mini-split installation.

Understanding Flaring Tools for Mini-Split Systems

Flaring tools come in various types, but for mini-split installations, an eccentric flaring tool is the recommended choice. Eccentric flaring tools create a 45-degree flare, which is the standard for mini-split systems. They also produce a consistent and reliable flare, which is essential for a leak-free installation.

Eccentric Flaring Tools

Eccentric flaring tools are designed to create a 45-degree flare on the copper tubing. This specific angle is crucial for mini-split systems, as it ensures a secure and airtight connection between the tubing and the mini-split unit. These tools are engineered to provide a uniform and consistent flare, reducing the risk of leaks and ensuring the overall integrity of the system.

One highly recommended eccentric flaring tool is the Bonvoisin Flaring Tool 1/4″-3/4″ HVAC Single Flare Tool 45° Eccentric Tube Flaring Tool with Clutch Limit Piece for Copper. This tool is specifically designed for HVAC applications and is known for its durability and ease of use. It can create flares on copper, aluminum, and stainless steel pipes, making it a versatile option for various mini-split installations.

Flaring Tool Components

Flaring tools typically consist of the following key components:

  1. Flaring Block: The flaring block is the main body of the tool, which holds the tubing in place during the flaring process. It is designed to accommodate different tubing sizes, ensuring a secure and consistent flare.

  2. Flaring Cone: The flaring cone is the part of the tool that actually creates the flare. It is shaped to match the desired flare angle, which for mini-split systems is typically 45 degrees.

  3. Yoke or Handle: The yoke or handle is the part of the tool that the user operates to apply the necessary force and pressure to create the flare.

  4. Clutch or Limit Piece: Some flaring tools, like the Bonvoisin model, feature a clutch or limit piece that helps to control the depth and consistency of the flare. This ensures that the flare is not over-tightened, which could lead to damage or leaks.

Preparing the Tubing for Flaring

what kind of flaring tool for mini split installationImage source: Flickr

Before using a flaring tool, it’s essential to ensure that the copper tubing is clean and free of debris. This can be achieved by using a reamer tool to deburr the inside of the tubing, ensuring a smooth and clean surface for the flare to be created.

It’s also recommended to use a pipe cutter specifically designed for copper tubing to ensure a clean and straight cut. This will help to create a consistent and uniform flare, further reducing the risk of leaks.

Choosing the Right Flaring Tool

When selecting a flaring tool for your mini-split installation, there are several factors to consider:

  1. Tubing Size: Ensure that the flaring tool can accommodate the specific tubing sizes used in your mini-split system, typically ranging from 1/4″ to 3/4″.

  2. Material Compatibility: Verify that the flaring tool can create flares on the type of tubing material used in your mini-split system, such as copper, aluminum, or stainless steel.

  3. Flare Angle: As mentioned earlier, for mini-split installations, you’ll want a tool that creates a 45-degree flare.

  4. Quality and Durability: Invest in a high-quality flaring tool that is built to last. A durable tool will not only save you time and money in the long run but also ensure a reliable and leak-free installation.

  5. Ease of Use: Consider the tool’s ergonomics and overall ease of use, as this can significantly impact the efficiency and accuracy of the flaring process.

Flaring Technique and Best Practices

When using a flaring tool, it’s essential to follow the manufacturer’s instructions carefully. Here are some best practices to ensure a successful flare:

  1. Proper Tubing Preparation: Ensure that the tubing is clean, free of burrs, and cut straight using a dedicated copper tubing cutter.

  2. Secure Tubing Placement: Firmly secure the tubing in the flaring block, ensuring that it is centered and aligned with the flaring cone.

  3. Controlled Flaring: Apply steady and even pressure when operating the yoke or handle to create the flare. Avoid over-tightening, as this can damage the tubing and lead to leaks.

  4. Consistent Flare Depth: If your flaring tool has a clutch or limit piece, use it to control the depth of the flare, ensuring a consistent and reliable result.

  5. Inspection and Deburring: After creating the flare, inspect the tubing for any remaining burrs or irregularities, and use a reamer tool to remove them if necessary.

By following these best practices and using a high-quality eccentric flaring tool, you can ensure a successful and leak-free mini-split installation.


Choosing the right flaring tool is crucial for a successful mini-split installation. An eccentric flaring tool, such as the Bonvoisin Flaring Tool, is the recommended choice due to its ability to create a consistent 45-degree flare, which is the standard for mini-split systems. By understanding the components of a flaring tool, properly preparing the tubing, and following best practices during the flaring process, you can ensure a reliable and leak-free mini-split installation.

Remember, investing in a high-quality flaring tool may cost more upfront, but it will ultimately save you time and money in the long run by reducing the risk of leaks and the need for repairs. With the right tool and technique, you can confidently tackle your mini-split installation project and enjoy the benefits of this efficient and energy-saving HVAC solution.

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