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Old 05-01-2008, 08:51 PM   #1
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Septic Pipe


I am installing a new line. Can someone explain the difference in the 4in pipe. The pipe I purchase is 4in, but the fitting does not fit the 4in already installed. Do I need the heavier pipe?

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Old 05-01-2008, 09:01 PM   #2
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Septic Pipe


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I am installing a new line. Can someone explain the difference in the 4in pipe. The pipe I purchase is 4in, but the fitting does not fit the 4in already installed. Do I need the heavier pipe?
My guess is the old pipe you're trying to connect to is either cast iron or clay, not PVC, right?

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Old 05-01-2008, 09:14 PM   #3
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My guess is the old pipe you're trying to connect to is either cast iron or clay, not PVC, right?
It PVC
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Old 05-01-2008, 09:21 PM   #4
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Septic Pipe


What color is it? Somewhere on the pipe should be a type of pipe number. If you are trying to connect to it it is best to just use the same pipe. If it is green pipe, then you will be looking to see if it is something like SDR26 or SDR35. Either that it is white and it would be Schedule 40 or Schedule 80. These are both plastic, but unless I am mistaken, they do not fit together. The Schedule Pipe is the same OD about as Cast Iron, which is larger than SDR pipe.

Not sure if it is legal or not, but a rubber mission coupling is probably a good solution to your problem, you can get them to transition from two different pipe types.
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