First, locate the main water shut-off valve for your house, which is often found in the basement, a crawlspace, or near the water meter. Turn the valve handle clockwise until it is fully closed. Next, relieve the pressure in the system by opening a faucet at the lowest point in your house (like a basement utility sink or an outdoor spigot) and also a faucet near the repair area. This will allow the water in the pipes to drain out. Place a bucket and have some rags or towels ready directly under the section of pipe you'll be cutting to catch any residual water.

Identify the leaking section of the 1/2-inch copper pipe. To ensure a clean, perpendicular cut, use a tubing cutter. Place the cutter around the pipe at one side of the damaged area and tighten the knob until the cutting wheel makes contact. Rotate the cutter around the pipe, tightening the knob slightly with each rotation until the pipe is cut through. Repeat this process on the other side of the damage, removing the faulty section. The goal is to create a gap that is slightly shorter than your push-to-connect coupling, allowing you to insert the pipe ends into the fitting.

This is a critical step for a successful repair. Take your deburring tool and insert it into the freshly cut pipe end, rotating it to remove any burrs from the inside edge. Then, use the tool's outer slots to smooth the outside edge. After deburring, take a piece of emery cloth or fine-grit sandpaper and thoroughly clean the outside surface of both pipe ends, extending about one inch back from the cut. The surface must be completely smooth, clean, and free of any oxidation, paint, or grime to allow the O-ring inside the fitting to create a perfect seal. Wipe the ends with a clean rag when finished.

To guarantee the pipe is inserted fully into the fitting, you must mark the correct insertion depth. For a 1/2-inch pipe, the typical insertion depth is 15/16 of an inch. You can confirm this by using the manufacturer-provided depth gauge or by holding the pipe next to the fitting and marking where the pipe bottoms out inside. Use a permanent marker to draw a clear line around the circumference of both pipe ends at the measured depth. This line will serve as a visual indicator during installation.

Take the 1/2-inch push-to-connect coupling. Align it with one of the prepared pipe ends. Apply firm, even pressure to push the fitting onto the pipe. A slight twisting motion as you push can help it slide on smoothly. Continue pushing until the edge of the fitting meets the depth mark you made earlier. You will feel a distinct 'click' or 'thump' as the pipe passes over the O-ring and seats against the internal stop. Repeat this process for the other pipe end, flexing the pipe slightly if necessary to achieve alignment. Pull gently on the fitting to ensure the internal teeth have grabbed the pipe and it is secure.

Once the fitting is securely in place, you must test the repair under pressure. Go back to the faucets you opened earlier and close them completely. Return to the main water shut-off valve and turn it on very slowly. A sudden rush of water can cause a 'water hammer' effect, stressing your plumbing. Once the valve is fully open, return to the repair site. Carefully inspect the fitting on all sides for any signs of moisture. Wipe the fitting and the surrounding pipe with a dry paper towel or rag to make even the smallest bead of water visible. Check for leaks again after 15 minutes and then after a few hours to ensure the seal is holding.