Best Practices in Compression Fittings

Updated: August 28, 2023

Part of our Series: The Ultimate Guide To Compression Fittings

Welcome to the 4th instalment of our series, the Ultimate Guide to Compression Fittings.

In the world of plumbing, using the right tools and techniques is paramount, and this rings especially true for compression fittings – the backbone of many plumbing and heating systems. In this section, we'll reveal insights and expert tips from industry professionals to help you make the most out of your compression fittings.

Choose High-Quality Compression Fittings

The first and most essential advice is to invest in high-quality fittings. Keep an eye out for clear markings from reputable manufacturers and look for fittings that appear well made. Ensuring they comply with industry standards and regulations is key, as this guarantees their reliability and durability.

Opting for well-made fittings will not only make installations easier but they will be backed up by good product guarantees, saving you precious time and effort down the road. Always remember, putting quality first instead of focusing solely on the price will pay off with better performance and a sense of confidence in your plumbing projects.

Properly Prepare the Tubing or Pipe

It's crucial to prepare the tube or pipe properly before installing your compression fitting. Take your time and cut the tubing squarely and smoothly to ensure the pipe sits neatly inside the fitting at the backstop. You can use a deburring tool to smooth out any small imperfections.

Hand-Tighten Before Torquing

When you're at the initial stage of installing the compression fitting, start by hand-tightening it until you feel enough resistance to not be able to continue. Hand-tightening is essential to prevent cross-threading and ensure proper alignment. Once the fitting is correctly positioned, it's time to bring in the big guns – a torque wrench or spanner.

Never Over-Tighten

One of the most common mistakes folks make during compression fitting installation is going overboard with the tightening. It's crucial to avoid over-tightening, as it can lead to deformations or even cracking of the fitting.

Always stick to the manufacturer's guidelines and, if they have them, their recommended torque values when tightening the fitting. Following these best practices ensures that your compression fittings work like a charm in your plumbing systems.


Compression fittings are a vital component in many plumbing and heating systems, and understanding how to use them effectively is key. By following the best practices shared by industry professionals, you can ensure the longevity and efficiency of your compression fittings. Whether you're a seasoned professional or a DIY enthusiast, we hope this post has provided valuable insights into the world of compression fittings.

We’re here to help

If you have any queries or questions about the products we sell, or even your next project, give us a shout! We'll try our best to give you a hand.