Flare Fittings vs. Compression Fittings: Understanding Their Differences

When connecting copper tubes or pipes in plumbing and gas systems, two popular options for creating secure, leak-free connections are flare fittings and compression fittings. These fittings play a vital role in promoting system integrity, although they function in slightly different ways. In this blog, we will briefly cover the key differences between flare fittings and compression fittings, providing you with a clear understanding of each to help you make informed decisions for your specific applications.

Flare Fittings: Precision Sealing for Copper Tubes

Flare fittings are known for their precision sealing capabilities, and they are commonly used in applications involving high-pressure gasses or liquids. One of the distinctive features of flare fittings is their conical shape found at the end of the copper tube. To create a connection with a flare fitting, the tube's end is flared, forming a smooth, conical surface. This conical shape ensures a tight seal when the fitting is assembled.

The sealing process with flare fittings involves two primary components: a flare nut and a metal washer often made of brass. The copper tube, after being flared, is inserted into the flare nut with the metal washer in place. When the flare nut is tightened to the mating component, the metal washer is compressed against the conical surface of the tube. This compression creates a secure, leak-free seal, which is ideal for high-pressure applications.

Compression Fittings: Versatile and User-Friendly

Compression fittings are versatile and widely used in a variety of applications, including plumbing, refrigeration, and air conditioning systems. What sets compression fittings apart is their ease of use and adaptability. They also do not require any special tools for installation, making them an attractive choice for DIY enthusiasts and professionals alike.

The key element in a compression fitting is the ferrule, which is a small, cylindrical ring typically made of brass. This ferrule is placed over the copper tube before it is inserted into the fitting. When the nut is tightened to the fitting, it compresses the ferrule against the tube, creating a seal. This compression process forms a reliable connection without the need for flaring or soldering.

While compression fittings offer convenience and versatility, they may not be as suitable for high-pressure applications as compared to other options. For example, the seal they provide is effective for many applications, but it may not be as robust as the precision seal achieved with flare fittings.

Choosing Between Flare and Compression Fittings

Selecting the right type of fitting depends on the specific requirements of your project. Here are some factors to consider when deciding between flare and compression fittings:

  • Pressure Levels: If your application involves high-pressure gasses or liquids, flare fittings are the preferred choice due to their precision sealing capability. For lower-pressure systems, compression fittings may suffice.
  • Tools and Skills: Consider your level of expertise and the tools at your disposal. Compression fittings are more user-friendly and do not require specialized tools, making them suitable for DIY projects. Flare fittings, on the other hand, demand more precision and typically require a flaring tool.
  • System Design: The design of your plumbing or gas system may also influence your choice. In some cases, a combination of both fitting types may be necessary to achieve a reliable and cost-effective solution.
  • Materials: Make sure to select fittings that are compatible with the materials used in your system. Both flare and compression fittings are available in a variety of materials to suit different applications.


As discussed in this blog, understanding the differences between flare fittings and compression fittings is essential for making informed decisions about your plumbing or gas system projects. While flare fittings excel in high-pressure applications with precision sealing, compression fittings offer versatility and ease of use. Carefully assess the requirements of your project and choose the fitting type that perfectly aligns with your needs.

Here at Methodical Purchasing, we invite you to explore our selection at your convenience and use our online RFQ service for quick and easy quotes on items you are interested in. After we receive your form and review your provided details, you can expect to receive a tailored solution within 15 minutes. Start your purchasing journey today and discover why Methodical Purchasing is a top choice of customers for part fulfillment.


November 23, 2022
September 22, 2022

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