Exclusive how to replace pex fittings like a pro: insider tips and tricks

Replacing PEX fittings may seem daunting, but with the right tools and a bit of know-how, it’s a task that even DIY enthusiasts can conquer. This comprehensive guide will lead you through the process, ensuring you achieve a leak-proof and reliable plumbing system.

Step 1: Gather Your Tools

Before embarking on this adventure, gather these essential tools:

• PEX cutter
• PEX reamer
• PEX insertion tool
• New PEX fittings
• Pipe wrench
• Rag or towel

Step 2: Turn Off the Water Supply

Safety first! Turn off the water supply to the affected area. Locate the main water valve and turn it clockwise to shut off the water flow.

Step 3: Cut the PEX Pipe

Using a PEX cutter, carefully cut the PEX pipe on both sides of the fitting you need to replace. Cut perpendicular to the pipe to ensure a clean and square cut.

Step 4: Ream the PEX Pipe

Deburr and smooth the cut ends of the PEX pipe using a PEX reamer. This will remove any burrs or rough edges that could interfere with the fitting’s insertion.

Step 5: Insert the New Fitting

Slide the new PEX fitting onto the reamed end of the pipe. Use the PEX insertion tool to push the fitting firmly onto the pipe until it stops.

Step 6: Tighten the Fitting

Using a pipe wrench, gently tighten the fitting’s nut onto the pipe. Do not overtighten, as this could damage the fitting or the pipe.

Step 7: Turn On the Water Supply

Turn the main water valve counterclockwise to restore water flow. Check the replaced fitting for any leaks. If you notice any leaks, retighten the fitting as necessary.

Tips for Success

• Use the correct PEX fittings for your application (e.g., crimp, clamp, or expansion).
• Cut the pipe cleanly and perpendicularly to prevent leaks.
• Reaming the pipe ensures a secure and leak-free connection.
• Do not overtighten the fittings to avoid damage.
• If you encounter any leaks, do not panic. Simply retighten the fitting and check again.

When to Call a Professional

While replacing PEX fittings is generally straightforward, there are some situations where it’s advisable to seek professional help:

• If you are not comfortable working with plumbing systems.
• If the leak is significant or cannot be stopped.
• If you suspect a more complex plumbing issue.

FAQ

Q: What is the difference between PEX A and PEX B fittings?
A: PEX A fittings are made of cross-linked polyethylene and are more flexible and resistant to chlorine than PEX B fittings. PEX B fittings are made of polyethylene and are more rigid and less resistant to chlorine.

Q: Can I use PEX fittings on copper pipes?
A: Yes, you can use PEX fittings on copper pipes by using a PEX adapter fitting.

Q: How long do PEX fittings last?
A: PEX fittings can last up to 50 years or more when properly installed and maintained.

Q: What causes PEX fittings to leak?
A: Common causes of PEX fitting leaks include improper installation, overtightening, damage to the fitting or pipe, or excessive water pressure.

Q: Can I replace PEX fittings under pressure?
A: No, it is not recommended to replace PEX fittings under pressure. Always turn off the water supply before working on plumbing systems.