How to install PEX tubing - making a crimp connection.
This tutorial will help you to understand the general techniques used to make a PEX crimp connection.
Shown on the images below respectively:
Take the PEX crimp ring and slide it over the tubing approximately 2” past the end.
Fully insert the PEX fitting into the PEX tubing in a way, so that the fitting’s shoulder touches the tubing.
Position the PEX crimp ring 1/4”-1/8” from the end of the tubing. This way the crimp ring will be right above the PEX fitting’s barbs.
Open the PEX crimp tool’s jaws.
Position the PEX crimp tool over the crimp ring evenly, at 90-degrees to the tubing. Make sure that jaws of the tool are centered over the crimp ring and it stays in place.
Close the crimp tool’s jaws completely.
Connection is complete.
Check the connection with a go-no-go gauge, to make sure that it was properly done. The images below show that the connection gauges properly. If it is possible (without applying extra force) to slide the go-no-go gauge fully over the crimp ring, or the gauge does not fit the crimp ring at all, the connection has to be redone. See the guide below for using the decrimping method.
If the connection does not gauge, or it was done improperly, a decrimper tool should be used to remove the crimp ring:
Using PEX cutter, cut off the section of the PEX tubing with the fitting installed. Try to make the cut as close to the fitting as possible, but make sure not to damage it or the cutter.
Open the jaws of the decrimping tool.
If you’re using an Everhot PXT3101 decrimper, use a quick switch knob to select the PEX tubing size. For the PXT3101 model, the “--” position is for 1/2" PEX, “+-” position if for 3/4" and 1” PEX.
Next, visually inspect the PEX decrimping tool. The tool has two jaws – one is for cutting the ring (the sharp one) and one to support the PEX fitting from the inside (the dull one). Insert the the decrimping tool into the cut-off section as shown.
Close the decrimper’s jaws completely. The ring will split.
Rotate the piece 180 degrees and repeat Step 5. The PEX crimp ring will fully split in half, making it easy to remove it by hand.
The remaining piece of PEX tubing can be easily removed from the fitting by squeezing the parts of the pipe where the copper crimp ring was not cut. This leaves an undamaged PEX fitting that can be used again.
The process of PEX tubing installation (making a crimp connection) is the same for both Oxygen Barrier PEX tubing and Non-Barrier PEX types.
PEX crimp connection method described in this tutorial is suitable for all types (A,B,C) of PEX tubing, regardless of brand or color. Typically, both crimp fittings and crimp rings are available in sizes 3/8”, 1/2”, 5/8”, 3/4”, 1” and 1-1/4”.
Crimp connection method is particulary popular among DIY's thanks to the ability to check a completed connection with a go-no-go gauge. No other connection method gives you such an option.
For sweat or threaded type PEX fittings, the transition part must always be connected first (also cooled off, if it is a sweat connection).
This article is for informative purposes only. For actual installation instructions, refer to manufacturer's manual.