How to Fix a Broken Backflow Valve in Your Main Cleanout
If you have an older home, you might have experienced plumbing issues like a shower backup. In this case, the culprit might be a faulty backflow valve. Here’s how you can troubleshoot and solve the problem.
Q: What is this inner pipe in my main cleanout, and how do I remove it?
A: The inner pipe you’re seeing is likely part of the main cleanout system, and the backflow valve might have been attached to it.
Over the years, your backflow valve may have become stuck or failed to release properly. As a result, it caused backups, leading you to manually lift the valve using a tool you made. Now that the valve has ripped off a few feet down, you’re left with a stuck inner ABS pipe that needs to be removed.
Here’s how you can tackle the issue:
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Examine the Pipe Setup: Start by checking if the backflow valve was attached to the inner ABS pipe. If it were, you may need to remove the pipe to replace the valve.
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Try Loosening the Pipe: The ABS pipe might be stuck due to sediment buildup or other debris. Use a pipe wrench or a large adjustable wrench to twist the pipe gently. Gradual pressure is key to avoiding damage.
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Lubricate the Joint: If the pipe is stuck hard, apply penetrating oil like WD-40 around the joint and let it sit for 15–20 minutes. This can help loosen the seal.
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Cut the Pipe (Last Resort): If the pipe is still stuck and there are no other options, you may need to cut it out using a pipe cutter or saw. Make sure you’re comfortable doing this, or consult a plumber if unsure.
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Install a New Valve: Once the pipe is removed, you can install a new backflow valve to prevent future backups. Make sure the valve is compatible with your system.
Conclusion
If you’re not sure about any part of the process or if the pipe remains stuck, it’s a good idea to reach out to a professional plumber. Proper installation of the new valve and pipe is crucial to avoid future issues.
For more plumbing tips and solutions, visit Plumbing 101.
I’m Chris Mayer, writing for Plumbing 101.
