Alexei Volkov
Capping off a plastic drain pipe is often necessary during a kitchen or bathroom renovation. For example, when replacing a sink, you may need to cut off the ends of the pipes and cap them. The process of capping off a plastic drain pipe involves shutting off the water supply, draining residual water and pressure from the pipes, and then cutting off the water pipes using a tubing cutter or a hacksaw. It is important to make a clean, square cut to ensure a proper seal with the cap. The end of the pipe must be cleaned and smooth, and the correct cap must be chosen. The cap can then be glued or pushed onto the pipe, depending on the type of cap. It is important to ensure that the cap is secure and that there are no leaks.
| Characteristics | Values |
|---|---|
| When to cap off a plastic drain pipe | During a kitchen or bathroom renovation |
| How to cap off a plastic drain pipe | Using a hacksaw, cut the pipe in the middle. Then, put one side of a dual hose clamp connector on the drain pipe and clamp it. Put a threaded cap into the clamp and secure it. |
| Types of caps | Push-to-connect caps, glue-on caps, PVC caps, Gripper plugs |
| Advantages of PVC caps | Durable, long-lasting, do not get damaged easily |
| Disadvantages of PVC caps | Risk of forgetting a cap that is not glued |
| Advantages of Gripper plugs | Air/pressure tight, easily removable |
| Disadvantages of Gripper plugs | More expensive than a simple PVC cap |
| Preventing leaks in PVC pipes | Cover the top of the pipe with a PVC cap. Coat the interior surface of the cap socket and the exterior surface of the pipe with PVC primer. Apply PVC cement to both primed surfaces. Slide the socket of the cap fitting into the end of the pipe. |
| Preventing leaks in push-to-connect caps | Clean the end of the cut pipe with a rag. Ensure it is smooth and free of old solder or other material. File off any rough edges. Measure from the end of the pipe and make a depth marking. Push the pipe cap onto the pipe until it reaches the depth mark. |
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What You'll Learn
Using a hacksaw to cut the pipe
Capping off a plastic drain pipe is a simple task that can be done using a hacksaw. Here is a step-by-step guide on how to use a hacksaw to cut the pipe when capping off a plastic drain pipe:
Measure and Mark the Cut Location:
Start by measuring the length of the pipe and determining where you need to make the cut. Use a tape measure to determine the required length, and then mark the cut location with a pencil. This will guide you in making a straight and accurate cut.
Prepare the Hacksaw:
Ensure that your hacksaw has a sharp blade with small, fine teeth suitable for cutting plastic. If the blade is blunt, replace it with a new one. Adjust the tension on the blade using the tensioning knob to ensure it is tightened appropriately for the task.
Create a Starting Notch:
Place the rear of the hacksaw blade on the cut line that you marked on the pipe. Carefully draw the saw back to create a notch in the pipe. This notch will prevent the blade from bouncing and provide a guide for the subsequent cutting motion. Repeat this process until you have a defined and clean notch.
Cut Through the Pipe:
Begin to slowly use a back-and-forth motion with the hacksaw, aligning the blade with the notch you created. Maintain a steady and controlled motion, avoiding rapid movements that may cause the saw to wiggle and create a crooked cut. As you reach the end of the cut, slow down to prevent the pipe from suddenly breaking off.
Smooth the Edges:
Hacksaws typically leave rough edges, known as burrs, at the cut point. Use a utility knife or a sharp knife to carefully remove these burrs and create a smoother finish. If needed, you can also sand any remaining rough areas on the edges of the cut to achieve a neater finish, especially if the pipe will be used for water flow.
Using a hacksaw to cut a plastic drain pipe is a straightforward and effective method. However, always prioritize safety and take your time to achieve a precise cut.
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Applying a PVC cap
Polyvinyl chloride (PVC) caps are a mixture of plastic and vinyl material. They are durable, long-lasting, and not easily damaged, which is why they are commonly used in water piping systems, underground wiring, and drain lines.
To apply a PVC cap to a plastic drain pipe, first, ensure that the pipe's diameter is two inches or more, as caps are generally available for pipes of this size or larger. Then, follow these steps:
- Wipe the ends of the pipe thoroughly.
- Coat the interior surface of the PVC cap socket and the exterior surface of the PVC pipe with PVC primer. Purple PVC primer is a commonly used variety.
- Apply PVC cement to both the primed surfaces. Regular clear PVC cement is suitable for this purpose.
- While turning the fitting 90 degrees, slide the socket of the cap fitting into the end of the pipe. This will spread the PVC cement evenly in the joint.
- Set the fitting in place for a few minutes to allow the PVC cement to settle.
If you are looking for a temporary solution, you can simply place a PVC cap over the pipe without gluing it. This method will prevent sewer gases from escaping. However, ensure that the drain lines are not subjected to wastewater, condensation, or similar issues. To remind yourself that the cap is temporary, you can write on it, and then place a baggie and a rubber band over it.
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Using a rubber band and baggie
Capping off a plastic drain pipe can be done in a variety of ways. One simple method is to use a rubber band and a baggie. This method is temporary and does not involve any gluing or permanent fixtures.
To begin, you will need to ensure the drain pipe is clear of any wastewater or condensation. This is important as the method will not work if there is a risk of backflow. Once the pipe is clear, take a plastic baggie and place it securely over the end of the pipe. You can then use a rubber band to tighten the baggie around the pipe, creating a seal.
It is important to note that this method is only suitable for certain situations. If there is an adjacent or higher source of wastewater that could backflow, this solution is not recommended. In such cases, a more permanent solution, such as gluing a cap or plug, should be considered.
Additionally, this method can be used in conjunction with other temporary measures. For example, one source suggests using a rubber band and baggie in combination with a cap. After placing the cap, write on it to indicate that it is temporary, and then cover it with a baggie and rubber band for added security. This helps to prevent accidental installations over the cap, such as bathroom tiles, which may cause issues later on.
Overall, the rubber band and baggie method is a simple and cost-effective way to temporarily cap off a plastic drain pipe. It is important to assess your specific situation and requirements to determine if this method is suitable, or if a more permanent solution is necessary.
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Using push-to-connect fittings
Capping off a plastic drain pipe with push-to-connect fittings is a straightforward process that does not require any special tools. Push-to-connect fittings, also known as push-fit or push-in connectors, are universal pipe fittings that can be used with copper, CPVC, or PEX plumbing pipes. They are ideal for temporarily capping water supply pipes during renovations or as a permanent installation, especially in pipes that pose less risk of future water damage.
Before beginning the capping process, it is important to shut off the water supply to your house to avoid any water damage. Locate the main shutoff valve, typically found on the side of the house or near the sewer line, and turn off the water supply. Drain residual water and pressure from the pipes by turning on a faucet or spigot that is lower than the pipes you will be working on. This will minimise the amount of water that spills out when you cut into the pipes.
Next, use a tubing cutter or a hacksaw to cut off the end of the pipe you need to cap. Ensure that you make a clean, square cut to guarantee a proper seal with the push-to-connect fitting. If you use a hacksaw, file off any rough edges and clean the end of the pipe with a rag to ensure it is smooth and free of debris. You can also use emery cloth to smooth rough surfaces, but be careful not to sand down the pipe. It should retain its original roundness and diameter.
Now you are ready to install the push-to-connect fitting. Measure and mark the length of the fitting on the pipe to ensure a complete fit. Insert the open end of the cap into the pipe and push it along until it reaches the depth mark. Listen for a click, which indicates that the pipe has tapped the end of the cap. Push-to-connect fittings typically include a stiffener, a small plastic cylinder that provides rigidity when capping PEX tubing. However, this is not required with copper or CPVC pipes.
Finally, turn the water back on and check the cap connections for leaks. Most push-to-connect fittings include a release feature that allows you to remove the fitting with a special tool provided by the manufacturer. Push-to-connect fittings offer a simple and quick solution for capping plastic drain pipes, making them a popular choice for both temporary and permanent installations.
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Removing the cap
Firstly, identify the type of cap that has been used. Common types include push-to-connect fittings, PVC caps, or simple end caps. Each type of cap has a unique removal process, so identifying the correct method is essential.
If you are dealing with a push-to-connect fitting, start by turning off the water supply to the house by shutting off the main valve. Then, drain any residual water and pressure from the pipes. You can do this by opening an outside spigot or a faucet that is lower than the pipes you are working on. This step is crucial to minimise the risk of water spillage during the removal process. Once the pipes are drained, you can proceed by pushing the fitting to depress the release collar and slipping the fitting off. Always use the manufacturer's specified tool for this step to avoid damage.
For PVC caps, the process is a bit different. Start by checking if the cap was glued on. If it was, you will need to carefully cut the pipe somewhere below the cap using a hacksaw or tubing cutter. Be sure to make a clean, square cut to ensure a proper seal when the pipe is reconnected. If the cap was not glued, simply grip the cap firmly and twist it while pulling it away from the pipe.
Simple end caps are usually removed by pushing a plastic piece at the base of the cap upwards while simultaneously pushing the cap downwards. This action disengages the teeth holding the cap in place, allowing it to be removed.
In all cases, it is important to work carefully and deliberately to avoid damaging the pipe or creating an uneven surface that could hinder reconnection and sealing. After removing the cap, be sure to clean the end of the pipe with a rag or emery cloth to ensure a smooth surface for reconnection.
Additionally, it is always recommended to have a bucket and old towels nearby to catch any residual water that may spill during the removal process, minimising the chance of water damage to your surroundings.
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