Basic Fitting Types for Connecting PEX Plumbing Pipe

New fittings had to be created to accommodate the use of the new PEX tubing, and these new components are appropriately called PEX fittings.  There are several different types of fittings to accommodate the various applications that may be needed. PEX tubing is run entirely through new homes builds while many retrofits, repairs or additions create a combination of copper tubing and PEX tubing in a home. This is why there are many PEX fitting options:

  • PEX Compression Fittings: A compression nut, a compression ring and a compression insert are the three useful components that make up a PEX compression fitting. These three pieces work together to secure the plastic PEX pipe. The assembly is connected using a threaded nut against a compression ring.
  • PEX Crimp or Clamp Fittings: As the name suggests, these fittings use a metal crimp to complete the connection. The crimps used are copper or stainless steel and are crimped with a PEX crimp or clamp tool.  These fittings are useful for PEX-to-PEX or PEX to Copper or PEX to other materials. This fitting is very popular as it can be used in a variety of applications. 
  • Push-Fit Fitting: There is no special tool needed. This may be the quickest fitting of the set. A unique feature about this fitting is that it can be removed and replaced using a small removal clip.
  • PexPress Fittings: These fittings are used primarily by the professional residential plumbers. They require a press tool and press sleeve. These are similar to crimp fittings.
  • Press Fittings: This fitting is quick and simple to install. The complexity of the seal is all in the fitting itself, so all the plumber needs to do is press the fitting onto the PEX tubing. 

Selecting one that is most useful for your application and getting familiar with the installation will help guide your choices job to job. USA made brass provides the best alloy to create any brass component, including plumbing fittings.