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How Do You Cap a Copper Line?

Published in Plumbing 2 mins read

To cap a copper line effectively using a push-to-connect end cap, simply insert the copper pipe into the open end of the cap and push until it reaches the mark on the pipe. Confirm a secure connection by pulling on the end cap to ensure it doesn't detach.

Here's a more detailed breakdown:

Steps to Capping a Copper Line with a Push-to-Connect Cap:

  1. Preparation: Ensure the copper pipe is clean and free of any burrs or sharp edges. A pipe cutter is recommended for a clean, square cut. Deburr the inside and outside of the pipe after cutting.
  2. Marking (if necessary): Some push-to-connect fittings require you to mark the insertion depth on the copper pipe. Consult the fitting manufacturer's instructions to determine if marking is necessary and where to mark.
  3. Insertion: Firmly push the copper pipe into the open end of the push-to-connect end cap. Continue pushing until the pipe reaches the internal stop within the fitting, or the mark you made on the pipe disappears inside the fitting. You should feel or hear a click indicating a secure connection.
  4. Testing: Once the pipe is inserted, pull firmly on the end cap. It should not come off. If it does, re-insert the pipe, ensuring it's fully seated. If it still comes off, the fitting or the pipe may be damaged and require replacement.
  5. Alternative Methods (Soldering): While push-to-connect fittings are convenient, soldering a copper cap is another common method. This requires flux, solder, and a torch. It is a more permanent solution but requires more skill and safety precautions.

Important Considerations:

  • Type of Cap: Using the appropriate end cap is crucial. Ensure it's designed for the specific diameter of your copper pipe and the intended pressure.
  • Push-to-Connect Fittings: These fittings provide a quick and easy method for capping copper lines without soldering. Brands like SharkBite are commonly used. Always follow the manufacturer's instructions.
  • Soldering: This method is more permanent, requiring cleaning, fluxing, heating with a torch, and applying solder. Practice safety precautions when working with a torch.
  • Water Supply: Before capping any water line, ensure the water supply is shut off to prevent leaks or water damage.

By following these steps, you can effectively cap a copper line using a push-to-connect end cap or by soldering, depending on your preference and skill level.