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Old 11-06-2013, 11:37 AM   #1
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Septic inspection cap


My specific system is 20 years old. It works fine, however the cap will not screw into the cast iron inspection. The threads on the pipe are corroded. I tried cleaning the threads out wit a brush, awl and screwdriver. No Luck. The real fix is kind of expensive, my septic guy said forget it really isn't worth it and just caulk it. Caulk just not very effective.

I just ordered a a rubber cap (hoping it fits) for the time being. My other thought was grinding the pipe off under the cap hub, using a rubber coupling to PVC pipe with screw cap. My concern here is methane and a sparking tool.

Any thoughts
Any suggestions
Thanks

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Old 11-06-2013, 12:39 PM   #2
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Septic inspection cap


Just use the rubber plug. As for Methane, there is not enough at that opening to cause a problem, let alone that you are outdoors. Otherwise, just use a Chain tool that is used for breaking Cast Iron piping.

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Old 11-06-2013, 01:54 PM   #3
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Just use the rubber plug. As for Methane, there is not enough at that opening to cause a problem, let alone that you are outdoors. Otherwise, just use a Chain tool that is used for breaking Cast Iron piping.
Thanks, I am going to use the plug in short term. I think renting the chain tool is definitely the better way to go (cleaner cut, safer).
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Old 11-06-2013, 02:39 PM   #4
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Septic inspection cap


You can get a plug called "lead fit-all". It's threads will conform to your clean out threads.

Or cut the pipe of with the chain or grinder and use an adapter of your choice
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Old 11-06-2013, 06:37 PM   #5
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Septic inspection cap


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You can get a plug called "lead fit-all". It's threads will conform to your clean out threads. Or cut the pipe of with the chain or grinder and use an adapter of your choice
Interesting. Are these fit-all's something I should replace every couple years when the pump out the tank?
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Old 11-06-2013, 06:55 PM   #6
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Septic inspection cap


Only if they get damaged too bad
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Old 11-06-2013, 09:15 PM   #7
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Only if they get damaged too bad
Thanks E that looks like like a way for me to keep it simple.



BTW the old cap measures ~5-1/2" across, do the sizes run nominal or actual (they look well tapered)?
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Old 11-06-2013, 11:27 PM   #8
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Thanks E that looks like like a way for me to keep it simple.



BTW the old cap measures ~5-1/2" across, do the sizes run nominal or actual (they look well tapered)?
Thats big- probably do a good google search to find one or call a plumbing supply house in your area. Some plugs will fit a couple thread sizes - 4"-4.5" as an example.
The key is to make sure you still have some existing female threads for the plug to grab

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