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Tighten Couplings and Test for Leaks — Restore Water and Test the Repair

Beginner3 hours

Part of project

How to Repair a Leaking Copper Pipe with a Compression Coupling · Step 7 of 7

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In this video

Once the new assembly is in place, use a screwdriver to firmly tighten the metal bands on all the flexible couplings. Ensure the bands are very tight to create a waterproof seal. After tightening, test the repair by flushing the toilet upstairs several times. Carefully inspect all the new joints for any signs of leaking or dripping. If no leaks are present, the repair is complete.

Goal: Finalize the installation and verify it is leak-free.

  • Use a nut driver bit on a drill for faster and tighter securing of the clamps, but finish by hand to avoid over-tightening and stripping.

Used in this video

  • Screwdriver (brand: Unknown, Tool Type: Hand tools, Power Source: Manual, Screwdriver_Type: Flathead) — Tightening the hose clamps on the flexible couplings.
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FAQs

How difficult is this repair for a beginner, and what if it takes longer than 3 hours?

This repair is rated beginner because it avoids complex techniques like soldering. While the estimated time is 3 hours, allow extra time for locating the leak, gathering tools, and ensuring the pipe system is fully drained. Rushing can lead to mistakes, so prioritize careful, precise work over speed.

Do I really need all the specific tools listed, or can I use substitutes for this project?

While tools like a dedicated tubing cutter and reamer are highly recommended for achieving clean, burr-free pipe ends crucial for a leak-proof seal, some items like permanent markers or measuring tape can be substituted with similar household tools. An adjustable wrench is essential, so ensure you have one that fits the coupling nuts securely.

What's the most common mistake beginners make with compression fittings, and how can I avoid a new leak?

The most common mistake is not properly preparing the pipe ends (cutting straight, deburring, and cleaning) or improperly tightening the compression nuts. Ensure pipe ends are perfectly smooth and burr-free, and tighten the nuts until snug, then give an additional 1/2 to 3/4 turn. Avoid over-tightening, which can deform the ferrule or strip threads, or under-tightening, which causes leaks.

What are the most important safety precautions I should take when repairing a leaking copper pipe?

Always shut off the main water supply and drain the pipes completely before starting to prevent water damage and potential electrical hazards. Wear safety glasses to protect your eyes from debris, especially when cutting or deburring the pipe. Be mindful of sharp edges on cut pipes.

Transcript
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Okay, so the toilet was just flushed upstairs and we do not have a leak. And basically this is what we were pleased. It's a little elbow coupling that goes up into the toilet. In this piece right here was 25 bucks at Ace Hardware, shout out to them. It's a four inch elbow that did not sell these at home depot or lows for some reason. So it took us longer driving all over town looking for this part than it actually did to put it in. And this is cast iron right here. Make sure you cut enough cast iron so that you can stick this coupling on. And that piece up there just goes straight into the lead pipe. So 25 for this one, 16 for that low coupling up there in the PVC underneath that you can see. That cost me $22. So totally that's about $60, $70 bucks total for everything versus $6.50. So I say that's a good deal. Save your money to buy Christmas gifts or give it to the poor. Anyway, get a bus y'all and I hope you learned something.

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