Are you tired of dealing with rusty and corroded metal P-traps in your plumbing system?
It’s time to make the switch to PVC!
Not only is PVC more durable and resistant to corrosion, but it’s also easy to work with and install.
In this article, we’ll guide you through the process of replacing your old metal P-trap with a new PVC one.
With just a few simple steps and some basic tools, you can upgrade your plumbing system and enjoy a more reliable and long-lasting solution.
So let’s get started!
How To Replace Metal P-trap With Pvc
Step 1: Purchase the necessary materials
Before you begin, you’ll need to purchase a PVC P-trap, pipe, and fittings to replace the metal ones. Make sure to buy material that’s the same diameter as the metal pipes you just removed. PVC drain pipe comes in two different diameters: 1 1/4 inches and 1 1/2 inches.
Step 2: Cut the PVC pipe to length
Using a hacksaw, cut the PVC pipe to the lengths that you need. This will depend on the specific configuration of your plumbing system.
Step 3: Connect the PVC pipe to the steel drainpipe
A rubber coupler connects the PVC pipe to the steel drainpipe. The drainpipe coming out of the wall has an adapter on the end. This adapter has a washer and slip nut and works just like the other joints in your drain assembly.
If your drainpipe is plastic, you shouldn’t have any problems. But if your drainpipe is old galvanized steel, you might run into corrosion that makes the slip nut almost impossible to loosen or retighten.
Step 4: Bypass rusty old threads
To bypass those rusty old threads, unscrew the old slip nut. Cut it off with a hacksaw if you have to, but try not to cut deep into the drainpipe’s threads.
Buy a plastic trap adapter, a rubber transition coupler, a section of plastic pipe, and cement. The pipe and adapter can be PVC (white) or ABS (black); just be sure to get the right cement for the type of plastic (PVC also requires purple primer).
Step 5: Cement the adapter to a piece of pipe
Cement the adapter to a 4-in. piece of pipe and join the plastic pipe to the old metal pipe using the rubber coupler.
Step 6: Test for leaks
Once everything is connected, turn on your water supply and check for any leaks. If everything looks good, congratulations! You’ve successfully replaced your old metal P-trap with a new PVC one.
What Is A P-trap And Why Replace It With PVC?
A P-trap is a type of plumbing trap that is commonly used in residential and commercial plumbing systems. The trap is designed to prevent sewer gases from entering your home by trapping a small amount of water in the bend of the pipe. This water creates a seal that blocks the gases from passing through the pipe and into your living space.
While P-traps are constructed with durable materials, they are vulnerable to damage, corrosion, and leaks as they become older. Leaks between pipe connections can cause damage to your kitchen cabinets and expose your household to unpleasant sewage odors. This is why it’s important to replace old or damaged P-traps with new ones.
When it comes to choosing a replacement P-trap, PVC is a great option. PVC (polyvinyl chloride) is a type of plastic that is lightweight, durable, and resistant to corrosion. PVC P-traps are easy to install and require minimal maintenance compared to metal traps. They are also less expensive than metal traps, making them a cost-effective option for homeowners.
In addition to being durable and cost-effective, PVC P-traps come in various sizes to fit different plumbing configurations. Make sure to buy material that’s the same diameter as the metal pipes you just removed. PVC drain pipe comes in two different diameters: 1 1/4 inches and 1 1/2 inches.
Tools And Materials Needed For The Job
To replace a metal P-trap with PVC, you’ll need the following tools and materials:
1. PVC P-trap, pipe, and fittings: Make sure to purchase material that’s the same diameter as the metal pipes you just removed. PVC drain pipe comes in two different diameters: 1 1/4 inches and 1 1/2 inches.
2. Hacksaw or pipe cutter: You’ll need to cut the PVC pipe to the lengths that you need, depending on the specific configuration of your plumbing system.
3. Rubber coupler: This connects the PVC pipe to the steel drainpipe. The drainpipe coming out of the wall has an adapter on the end. This adapter has a washer and slip nut and works just like the other joints in your drain assembly.
4. Plastic trap adapter: If your drainpipe is old galvanized steel, you might run into corrosion that makes the slip nut almost impossible to loosen or retighten. To bypass those rusty old threads, unscrew the old slip nut and cut it off with a hacksaw if you have to. Then, buy a plastic trap adapter, a rubber transition coupler, a section of plastic pipe, and cement.
5. Cement: You’ll need cement to join the plastic pipe to the old metal pipe using the rubber coupler. Be sure to get the right cement for the type of plastic (PVC also requires purple primer).
6. Tongue and groove pliers: These will come in handy when tightening slip nuts and connecting pipes.
7. Bucket: Use a bucket to catch any water that may spill out during the process.
8. Work light: Depending on where your P-trap is located, you may need a work light to see what you’re doing.
By having these tools and materials on hand, you’ll be well-prepared to replace your old metal P-trap with a new PVC one.
Removing The Old Metal P-trap
Removing the old metal P-trap can be a bit tricky, especially if the nuts are stuck due to corrosion. Here’s a step-by-step guide to help you remove the old metal P-trap:
Step 1: Turn off the water supply
Before you start removing the old metal P-trap, turn off the water supply to prevent any water from flowing through the pipes.
Step 2: Unscrew the nuts
Use adjustable pliers to unscrew the nuts that connect the P-trap assembly to the drain extension or tailpiece and the waste line. If the nuts are stuck, you can try using spray lubricant to loosen them. If you’re unhooking a double sink, make sure to loosen the nuts on both tailpieces.
Step 3: Remove the metal pipes
Once you’ve unscrewed the nuts, you can remove the metal pipes. Be careful not to damage any other parts of your plumbing system as you do this.
Step 4: Inspect for corrosion or leakage
Inspect the metal pipes for any signs of corrosion or leakage. If you notice any damage, it’s best to replace those parts with new ones.
Step 5: Install the new PVC P-trap
Now that you’ve removed the old metal P-trap, it’s time to install the new PVC one. Follow the steps outlined in the previous section to cut and connect the PVC pipe to your drain system.
By following these steps, you can safely and effectively remove your old metal P-trap and replace it with a new PVC one.
Measuring And Cutting The PVC Pipe
Before you start cutting the PVC pipe, it’s important to measure the length you need. Measure the distance between the two points where the PVC pipe will be installed. Use a measuring tape to get an accurate measurement.
Once you have your measurements, use a hacksaw to cut the PVC pipe to the desired length. Make sure to cut the pipe straight and smooth, as uneven cuts can cause leaks.
If you’re replacing more than one section of pipe, dry fit the pieces together to make sure they fit correctly. The pieces of PVC pipe that go into the wall will need to be cut long enough so that they go inside the pipe a couple of inches and are held in place by the nut and washer.
It’s important to note that PVC pipes should not be cut too short, as this can cause leaks. It’s better to cut the pipe a little longer than necessary and then trim it down if needed.
After cutting the PVC pipe, use sandpaper or a deburring tool to smooth out any rough edges. This will prevent any debris from getting caught in the pipes and causing blockages.
Remember to always wear safety goggles when cutting PVC pipes, as small pieces of plastic can fly off and cause eye injuries.
Assembling The New PVC P-trap
Now that you have all the necessary materials and have connected the PVC pipe to the steel drainpipe, it’s time to assemble the new PVC P-trap.
Step 1: Attach the PVC P-trap to the drainpipe
Slide the slip nut and washer onto the PVC P-trap. Insert the trap arm into the wall drain fitting and tighten the slip nut onto the adapter. Make sure not to overtighten, as this can cause damage to the PVC pipe.
Step 2: Attach the PVC P-trap to the sink drain
Slide another slip nut and washer onto the other end of the PVC P-trap. Insert this end into the sink drain and tighten the slip nut onto the sink tailpiece.
Step 3: Adjust the height of the P-trap
Adjust the height of the P-trap by sliding it up or down on the wall drain fitting. The trap arm should be level with or slightly above the drain outlet on the sink.
Step 4: Secure all connections
Make sure all connections are secure by giving them a gentle tug. Any loose connections can cause leaks.
Step 5: Test for leaks
Turn on your water supply and check for any leaks. If everything looks good, congratulations! You’ve successfully assembled your new PVC P-trap.
Replacing a metal P-trap with a PVC one can be a bit intimidating, but by following these steps, you can do it yourself and save money on hiring a plumber. Just remember to take your time, use caution when cutting into old pipes, and always test for leaks before calling it a job well done.
Installing The New P-trap In Your Plumbing System
Now that you have all the necessary materials and have connected the PVC pipe to the steel drainpipe, it’s time to install the new P-trap in your plumbing system. Follow these steps to ensure a proper installation:
Step 1: Slide the nut over the sink drainage tailpiece
Slide the nut over the sink drainage tailpiece and then slip the washer onto it. When inserting the washer, make sure its beveled ending faces downward.
Step 2: Slide the drain trap bend over the tailpiece
Next, slide the drain trap bend over the tailpiece. Position the bend in a manner that the opposite ending takes in the curved ending of the trap arm.
Step 3: Adjust the trap arm if necessary
Adjust the trap arm inward and outward of the drainage opening if necessary. If you find that the trap arm is longer than your existing sink configuration, cut the straight section of the trap arm to a matching size using a PVC cutter or hacksaw. Some kits may come with trap arms of various sizes to make installation easier.
Step 4: Tighten slip nuts
Once you have adjusted everything properly, tighten the slip nut on the tailpiece lightly. Also, tighten the slip nut on the trap bend lightly. Tighten them in an alternating manner until the slip washers are tightly fitted in place.
Step 5: Test for leaks
Finally, turn on your water supply and check for any leaks. If there are no leaks, congratulations! You have successfully installed your new PVC P-trap.
In conclusion, replacing a metal P-trap with a PVC one may seem daunting at first, but with these step-by-step instructions and some basic plumbing knowledge, you can easily complete this DIY project. Remember to take your time and double-check all connections for leaks before finishing up.