Connecting plastic water lines to copper pipes is a common plumbing task, and it can be achieved effectively using compression fittings. These fittings create a secure, leak-proof connection.
Understanding Compression Fittings
Compression fittings are a popular choice for joining dissimilar materials like plastic and copper because they don't require soldering or gluing. They rely on mechanical pressure to form a seal.
Components of a Compression Fitting
- Threaded Nut: Used to tighten and compress the fitting.
- Compression Ring (or Ferrule): Creates the actual seal when compressed against the pipe.
- Insert Adapter: A sleeve inserted into the plastic pipe to provide rigidity and prevent crushing.
Step-by-Step Connection Process
Here’s how to connect a plastic water line to a copper pipe using a compression fitting:
- Prepare the Copper Pipe: Ensure the copper pipe end is clean and free of burrs. Use a pipe cutter to achieve a square cut, if necessary.
- Prepare the Plastic Pipe: Cut the plastic pipe squarely. Make sure it's clean and free of any debris.
- Insert the Adapter: Insert the plastic pipe into the insert adapter.
- Assemble the Fitting:
- Slide the threaded nut onto the plastic pipe.
- Slide the compression ring onto the plastic pipe.
- Insert the plastic pipe assembly into the fitting.
- Tighten the Nut: Hand-tighten the nut onto the fitting. Then, use a wrench to tighten it an additional one to one and a half turns. Do not overtighten, as this can damage the fitting and cause leaks.
- Test the Connection: Turn the water supply back on and check for leaks. If leaks occur, tighten the nut slightly more, but avoid excessive force.
Key Considerations
- Proper Pipe Size: Ensure that the pipes are the correct size for the fitting. Using undersized or oversized pipes can cause leaks or damage to the fitting.
- Quality Fittings: Use high-quality compression fittings designed for use with plastic and copper pipes.
- Installation: Always follow the manufacturer’s instructions for installing the specific fittings.
- No Solder: Compression fittings do not require solder, making installation faster and safer.
- Check for Compatibility: Always check the compatibility of the plastic and copper before attempting to connect, and refer to the fitting's specifications.
- Avoid Reusing: Do not reuse compression fittings once they have been used.
Summary of Steps
| Step | Action |
|---|---|
| 1 | Prepare the copper pipe by cleaning and cutting. |
| 2 | Prepare the plastic pipe by cleaning and cutting. |
| 3 | Insert the plastic pipe into the insert adapter. |
| 4 | Assemble the fitting by sliding on the nut and compression ring. |
| 5 | Tighten the nut by hand, then using a wrench. |
| 6 | Test the connection for leaks. |
By using compression fittings, you can create a secure and reliable connection between plastic water lines and copper pipes. Remember to follow the proper installation steps and guidelines for a successful plumbing job.
