Omar Khalid
If you need to stop off a plastic water pipe, there are several methods you can use. One quick fix is to wrap a towel around the pipe and tie it with a piece of string to minimise the flow of water while you turn off the main valve. If you need to remove a plastic end cap, you can push up the plastic piece at the base of the cap while pushing the cap down. You can also use a plastic cap secured with a hose clamp, or a self-sealing compression fitting installed with a wrench.
How to stop off plastic water pipes
| Characteristics | Values |
|---|---|
| Turn off the main water supply | If there is a stop valve on the pipe, ensure it is off |
| Drain the system | |
| Use a valve | |
| Use a cap | May need to purchase an end cap for the specific tubing |
| Use a compression fitting | |
| Use a glue-on cap fitting | |
| Use a pushfit endcap | |
| Block the pipe | Stuff plastic bags down the pipe, or fill a cap with cement |
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What You'll Learn
Using a plastic cap and hose clamp
If you're looking to stop off a plastic water pipe, one method you can use is a plastic cap and hose clamp. Here's a step-by-step guide on how to do it:
First, make sure the main water supply is turned off before beginning any work on the water pipes. This will prevent any accidental leaks or spraying water when removing the cap. It's important to ensure that you have the right size and type of plastic cap for your specific pipe. The pipe type is usually printed on the pipe itself. Take this information with you when purchasing the end cap from a hardware store or RV supply store.
Once you have the correct plastic cap, inspect the end of the pipe to ensure there is no scoring or damage. Remove any damaged portions of the pipe before installing the new cap. Clean the end of the pipe to ensure a tight and secure fit for the cap. You may need to use a pushfit endcap, which simply needs to be pushed firmly onto the end of the pipe. Alternatively, you may need to use a glue-on cap fitting, which requires a suitable adhesive to create a watertight seal. If using glue, be sure to follow the manufacturer's instructions for proper application and drying time.
In some cases, you may need additional tools and fittings. For example, if using a cap that fits inside the pipe, you will need a crimp tool and a copper ring to secure the cap in place. This method provides a strong and reliable connection but does require the additional expense of a crimp tool. Another option is to use a compression fitting, such as a Shark Bite, which can be installed with a wrench. This type of fitting compresses onto the pipe, creating a secure and leak-proof connection.
Finally, once the cap is securely in place, you can further reinforce the connection by using a hose clamp. Position the clamp around the pipe, just above the cap, and tighten it with a screwdriver or wrench. This adds an extra layer of security, ensuring that the cap remains firmly in place and preventing any accidental leaks. By following these steps, you can effectively stop off a plastic water pipe using a plastic cap and hose clamp.
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Using a compression fitting
Before starting any work on removing a compression fitting, it is crucial to prioritise safety. The first step is to turn off the water supply to the affected area to avoid unnecessary water leaks or damage. Locate the water shutoff valve near the area where you're working, usually under sinks or near the main water supply, and turn the valve clockwise to stop the flow of water. If the area is connected to a larger system, make sure to shut off the main water supply.
Once the water supply is turned off, you can begin the process of removing the compression fitting. Compression fittings consist of three main parts: a pipe with male threads that accommodate the water line, a ferrule that fits into the gap between the pipe and the fitting, and a compression nut that tightens the ferrule into the gap to create a watertight seal.
To release a plastic compression fitting, you will need two pairs of locking pliers. Use one pair to grip and turn the compression nut counterclockwise, while the other pair holds the pipe steady and prevents it from turning. It may require some effort to loosen the nut, but once it starts to turn, you can usually finish unscrewing it by hand. After removing the nut, pull out the ferrule from the pipe.
If the compression nut is stubborn and difficult to turn, there are a few techniques you can try. One approach is to apply penetrating oil, such as WD-40, PB Blaster, or Liquid Wrench, around the threads of the compression nut. Allow the oil to sit for about 5 to 10 minutes to break down any rust or debris. Then, try loosening the nut again with a wrench or pliers. Alternatively, you can apply mild heat to the area around the compression fitting for 1 to 2 minutes using a heat gun or a propane torch. Be cautious not to overheat, as excessive heat can damage plastic pipes.
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Using a self-sealing compression fitting
First, locate the main water shutoff valve, usually found near the water meter or where the main water line enters your house. It could be in a basement, crawl space, or utility room. Turn the valve clockwise to shut off the water supply and ensure no water escapes when you begin working.
Next, inspect the compression fitting for any signs of damage or corrosion. Look for cracks, rust, or any deformation in the fitting, nut, or pipe. Identifying issues beforehand can help you take the necessary precautions and avoid further damage during the removal process.
Now, you can begin removing the compression fitting. This typically involves turning off the water supply, releasing the gripper ring, loosening the compression nut, removing the nut and ferrule, and detaching the pipe. Remember that understanding the correct process is crucial, as applying excessive force or rushing can lead to cracked or bent pipes.
Once the old fitting is removed, you can install the new self-sealing compression fitting. Ensure the pipe is clean and free of any scored or damaged sections. Apply a light layer of pipe joint compound or Teflon tape to the pipe threads for added protection. Insert the pipe into the new fitting, ensuring it sits deeply enough to form a tight seal. Then, use a wrench to tighten the fitting securely, being careful not to over-tighten, as this can cause cracking and leaks.
Finally, turn on the water supply and check for any leaks around the new fitting. Proper sealing is critical to prevent water leaks and protect your pipes.
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Using a glue-on cap fitting
Capping off a PVC water pipe involves two methods: permanent and temporary. For the permanent method, you will need to use primer and cement before placing the cap. The temporary method involves using push-on fittings, which are mainly used for temporary PVC pipe sealing.
Step 1: Choose the Right Cap
Select a cap that is compatible with the diameter of the pipe.
Step 2: Shut Off the Water Supply
Before cutting the pipe, turn off the water supply by shutting off the main power switch. Let any residual water flow out of the faucet.
Step 3: Cut the Pipe
Cut the pipe as short as possible to make the pipe opening even. Use a hacksaw or a PVC cutter to cut the pipe.
Step 4: Prepare the Pipe
Clean the end of the pipe with a rag. If the edge is not smooth, sand it down with emery cloth or sandpaper.
Step 5: Dry-Fit the Pipe
Dry-fit the pipe and the PVC pipe connector fitting. Use a torpedo level if needed to align the fitting. Make a mark across the fitting and pipe to guide you when gluing the pieces together.
Step 6: Apply Primer
Wipe the inside of the fitting and the outside of the pipe with PVC primer. Allow the primer to dry for about 10 seconds.
Step 7: Apply Solvent Cement
Spread an even layer of solvent PVC cement on the inside of the fitting and the outside of the pipe. Be careful not to apply too much cement to the inside of the socket on the fitting to prevent excess from being pushed into the water piping.
Step 8: Join the Pipe and Fitting
Quickly press the pipe and fitting together, ensuring proper alignment. Hold the pieces together for about 30 seconds.
Step 9: Allow Drying Time
The glue will need time to cure. Refer to the instruction manual for the specific cure time. Typically, 24 hours should be enough for the glue to dry.
Step 10: Test the Connection
After the glue has dried, turn on the water supply and test for any leaks.
Remember, once the pipe and fitting are glued together, it is difficult to separate them. If you need to remove the cap in the future, you may need to cut it off.
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Using a valve
Shut-off valves, also known as supply stop valves, are used to connect supply lines to sinks and toilets. They also help to isolate and repair leaks near fixtures without shutting off the water supply to the entire house.
Shut-off valves can be replaced using a solder-type, compression-type, or push-to-connect type stop valve. To determine which type of valve you need to replace, check whether the existing valve is connected to the pipe using solder, a compression fitting, or a threaded fitting. Soldered connections are often identified by discoloured pipes and fittings. Compression fittings are marked by a large compression nut where the valve connects to the pipe. Threaded connections are identified by visible threads where the fitting connects to the pipe.
If you are installing a push-to-connect type valve, press it squarely and evenly onto the pipe until it bottoms out. Pull it slightly to ensure that it is locked in place. If you are installing a compression-style valve, thread the valve into the compression, ensuring that it slides squarely and snugly over the ferrule/compression ring. Hand-tighten the nut onto the valve, then finish tightening the nut using one adjustable wrench to hold the valve squarely and another to turn the nut. Do not overtighten the nut, as this will over-compress the ferrule.
If you are installing a thread-style valve, thread the valve onto the pipe and hand-tighten. Use a pipe wrench to secure the pipe and tighten the valve using an adjustable wrench. Again, do not over-tighten, as this could crack the valve or damage the threads.
PVC ball valves are another type of valve used for main water shutoffs and branch line shutoffs. They are considered to be one of the most reliable and commonly used valves. They are called ball valves because there is a ball inside that has a hole in the middle that is connected to the handle that opens and closes. To loosen a PVC ball valve, position a pipe wrench around the handle of the valve and try turning it. If it moves, keep turning it off and on for a couple of minutes to loosen it. Once the valve is moving, turn the water back on at the main shutoff valve and keep turning the PVC ball valve until the looseness reaches the desired level. If the valve still won't move, you will need to replace the ball valve.
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Frequently asked questions
To minimise water flow, wrap a towel around the pipe and tie it with a piece of string above and below the break. Place a bucket under the pipe to collect the water that may seep through.
You can try to match a threaded fitting to the pipe. If this is not possible, you can purchase an end cap for the specific tubing. Alternatively, you can install a self-sealing compression fitting with a wrench or a simple glue-on cap fitting.
First, ensure that the main water supply is turned off and drain the system. Then, push the plastic piece at the base of the cap up while simultaneously pushing the cap down.
