Press vs Capillary Fittings

Understanding the differences between these fittings can help you make an informed decision for your project. This guide will provide a detailed comparison of Capillary Fittings and Press Fittings covering their features, advantages, disadvantages, and best applications.

What Are Press Fittings?

Press fittings are modern plumbing connectors that use mechanical force to create a seal between the fitting and the pipe. These fittings are installed using a specialised press tool, which compresses the fitting around the pipe, creating a leak-proof seal without the need for heat or solder.

Press

Discover Flowflex Press fittings, ideal for domestic, commercial, and industrial applications. Offering heat-free, aesthetically pleasing joints, our independently approved fittings ensure speedy installations. Available in sizes from 15mm to 108mm, they provide a cost-effective and reliable solution. Click to explore our comprehensive range of M-Profile Copper Press fittings.

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Key Features of A Press Connection

• Fitting Body
  Made of brass, copper or steel, designed to fit snugly around its respective pipe.

• Pipework
  Copper tube manufactured to EN 1057 standards, steel tube manufactured to EN 10305 or EN 10312 standards, or multilayer pipe manufactured to ISO 21003.

• Seal
  Utilises a rubber O-ring, typically made of EPDM or similar, which is compressed against the pipe during the pressing process to form the seal.

Advantages of Press Connections

• Fast and Easy Installation
  The installation of Press Fittings is very quick, saving time compared to other methods like soldering, brazing or using Compression Fittings.

• Minimal Training Required
  Unlike more traditional methods, Press Fittings are easy to learn and use.

• No Flame Required
  Since no heat is used, Press fittings are ideal for installations in areas where flames are restricted or pose a fire risk.

• Reliable and Leak-Proof
  When installed correctly, Press fittings provide a secure, leak-proof connection that meets industry standards.

• Can Be Installed When Wet
  No need to drain water out of the system during installation

• Environmentally Friendly
  Copper, Brass and Steel are all highly recyclable materials, making metal Press Fittings an environmentally friendly option for your project.

• Neat, Aesthetic Appearance
  Press fittings offer a sleek, professional look that is great when aesthetics are important. Their streamlined design blends seamlessly with the pipework, making them suitable for visible applications in both residential and commercial settings.

• Versatile Applications
  Press Fittings are suitable for hot and cold water, heating systems, compressed air, and some gas applications (depending on the type of o-ring used).

• Reduced Risk of Installation Errors
  The precision of the press tool minimises the risk of errors during installation. The tool’s built-in safety features, such as press indicators, ensure that each fitting is correctly compressed, resulting in a secure and leak-proof connection.

Disadvantages of Press Connections

• Higher Initial Cost
  Press fittings and the required press tool are more expensive upfront compared to other more traditional methods.

• Tool Dependency
  A specialised press tool is necessary for installation, which can be costly and requires maintenance.

• Limited Access in Tight Spaces
  Press tools may have difficulty accessing fittings in confined spaces, making installation challenging in certain scenarios.

Best Use Cases For Press Fittings

1. Commercial and Industrial Plumbing
   Press fittings are perfect for large-scale installations where speed and consistency are essential, providing a quick and reliable connection with minimal effort.

2. Heat Free Installations
   Press fittings are an excellent choice for installations where the use of an open flame is not permitted, ensuring a safe and efficient connection without the need for soldering.

3. Low Skilled Installations
   Press fittings are perfect for commercial applications that require minimal specialised skills. Their user-friendly design and simple, secure connections make them suitable for a broad range of users.

What Are Capillary Fittings?

Capillary Fittings, also known as Soldered Fittings, are the most traditional plumbing connectors that use capillary action to form a secure bond between the fitting and the pipe. These fittings are made of copper, brass or bronze, and require soldering to seal the joint. Capillary fittings are commonly used in domestic and commercial plumbing, heating, and cooling systems.

Capillary

Flowflex Capillary fittings are designed for precision and reliability in copper pipe connections. Featuring a capillary action for secure, leak-free joints, they ensure ease of installation and longevity. Ideal for domestic and commercial applications, these fittings provide a neat, robust, and corrosion-resistant solution for HVAC systems.

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Key Features of a Capillary Connection

• Fitting Body: Made of copper or brass, designed to fit snugly around copper pipe manufactured to BS EN 1057 standards.

• Copper Pipe: Copper tube manufactured to BS EN 1057 standards.

• Solder: A metal alloy used to bond the fitting and pipe together when heated.

• Flux: A chemical cleaning agent applied to the joint before soldering to prevent oxidation and ensure a strong and clean bond.

Advantages of Capillary Connections

• Strong, Permanent Joints
  Soldered joints create a durable, leak-proof seal that can withstand high pressure and temperature changes.

• Can Support Higher Pressures
  Depending on the choice of solder, Capillary Fittings can reach pressure ratings of PN25.

• Environmentally Friendly Material
  Copper is a sustainable and recyclable material, making capillary fittings an environmentally friendly option.

• Compact Design
  Soldered fittings are sleek and low-profile, making them ideal for exposed installations where aesthetics matter or tight spaces where access is limited.

• Cost-Effective
  Generally cheaper than other types of fittings, making them popular for large installations.

• Highly Reliable
  Minimal risk of leaks when installed correctly due to the solid bond between the fitting and the pipe.

Disadvantages of Capillary Connections

• Requires Open Flame
  The use of a torch introduces safety risks, particularly in areas where flammable materials are present or where heat is restricted.

• Higher Skill Level Required
  Proper soldering technique is crucial; poor preparation or overheating can result in weak joints or leaks.

Comparing Press Fittings and Capillary Fittings

Which one Should You Choose?

Choosing between capillary and press fittings depends on your specific project requirements:

Choose Capillary Fittings if:

• You need a cost-effective solution and have the time and skills for soldering.

• The installation environment allows for the use of heat and open flames.

Choose Press Fittings if:

• You require a fast, flame-free installation process, especially in sensitive or hazardous areas.

• You are working on a large-scale commercial project where time savings are critical.

Wrapping Up

Both Capillary and Press Fittings offer distinct advantages and are valuable tools in modern plumbing. Capillary Fittings provide a traditional, reliable option for those with the skills and time to solder, while press fittings offer speed, safety, and convenience, making them ideal for quick turnarounds and sensitive environments. Understanding the strengths and limitations of each type will help you choose the best fitting for your needs, ensuring a secure and efficient plumbing system.

Capillary

Press