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Connecting PEX Tubing — Insert Fitting into Tubing

Beginner2 hours

Part of project

How to Cut and Crimp PEX Tubing Like a Pro · Step 4 of 6

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In this video

Begin by creating a clean, straight, 90-degree cut on the end of the PEX tubing using a PEX tubing cutter. This ensures a proper seal. Next, take the push-fit fitting, which should contain an internal stiffener for PEX applications. Align the tubing with the fitting and push it in firmly with a slight twisting motion until you feel it seat completely. Give it a gentle tug to confirm the connection is secure.

Goal: Create a secure connection between PEX tubing and a push-fit fitting

  • If a fitting does not have a pre-installed stiffener, one must be inserted into the PEX tubing before making the connection.
  • An improper or angled cut can compromise the seal and lead to leaks.

Used in this video

  • PEX Tubing Cutter (brand: none, Tool Type: Cutting tools, Power Source: Manual) — Creating a clean, 90-degree cut on the PEX tubing.
  • Push-Fit Fitting (brand: none, Material: Brass, Purpose: Joining) — Joining sections of PEX tubing.
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FAQs

Why is using a go/no-go gauge so critical after crimping PEX, and what does it tell me?

The go/no-go gauge is essential for ensuring your crimp connection meets industry standards and is leak-proof. The 'go' side should fit over the crimp ring, and the 'no-go' side should not. This confirms your crimp is properly sized and secure, preventing costly leaks down the line.

What are the most common mistakes beginners make when crimping PEX tubing, and how can I avoid them?

Common mistakes include not cutting the tubing squarely, placing the crimp ring too far from the end of the tubing, or failing to use the go/no-go gauge. To avoid these, ensure clean, square cuts, position the crimp ring about 1/8 inch from the end of the tubing and over the barb, and always verify your crimp with the gauge.

The materials list both PEX-A and PEX-B tubing. Does the type of PEX tubing (A or B) affect how I use copper crimp rings?

While copper crimp rings primarily use barbed fittings that are compatible with PEX-B and PEX-C, they can also be used with PEX-A tubing. The crimping method itself remains the same for all PEX types when using barbed fittings and copper crimp rings, but PEX-A is also commonly used with expansion fittings.

How accurate is the 'beginner' difficulty rating for this project, and what's a realistic time estimate for a first-timer to get a good crimp?

The 'beginner' rating is accurate as the steps are straightforward once understood, but practice is key. For a first-timer, expect each connection to take 10-15 minutes initially as you get familiar with tool handling and positioning. With a few successful crimps, your speed and confidence will quickly increase.

Transcript
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Copper pipes don't require this, so you can take this right out of the tube. So just like before you make any connection, you want to start with a nice 90 degree cut. So a lot of press fittings have this stiffener on the inside for pecs tubing to keep its shape once the fitting is on. But if it doesn't have it, you can just insert one here. Luckily this fitting has it, so all you have to do is push and it's in.

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