I need to replace the pipe from my house to my septic tank, because it is partially collapsed (on the lower portion, which is thinner pipe), and install a cleanout. The house was built in 1977. The pipe coming out of the slab is fairly thick and is stamped PLASTIC in black. Diameter is 4 1/2 inches. As you can see, it goes through a multitude of connections, some of which I don't understand (it looks like a smaller pipe was just slipped inside a larger pipe). The elevation needs to drop about 1 ft. Any advice will help. See attachments.
Questions:
1. What is this type of old main pipe called and how do I connect to it?
2. Do I likely just need a standard 4" pipe into the septic tank?
3. How should I seal the pipe to the septic tank inlet (It goes thru a round hole that is roughly 4" but a bit larger)?
Thanks a lot
BasicPoke
![IMG_8824_25%.JPG IMG_8824_25%.JPG](https://cdn2.imagearchive.com/plumbingforums/data/attachments/2/2649-e760cc9c71ddf8a9131e93982287c3e7.jpg)
![IMG_8826_collapsed part.JPG IMG_8826_collapsed part.JPG](https://cdn2.imagearchive.com/plumbingforums/data/attachments/2/2650-622ad8af91e50c03da7d6e45de2cf30b.jpg)
![IMG_8828_25%.JPG IMG_8828_25%.JPG](https://cdn2.imagearchive.com/plumbingforums/data/attachments/2/2651-53e71421d9ba06f5cb79bad1071b68b2.jpg)
![IMG_8829_25%.JPG IMG_8829_25%.JPG](https://cdn2.imagearchive.com/plumbingforums/data/attachments/2/2652-8f33068a6b10e6ebe7be1acb1f9fa2bc.jpg)
Questions:
1. What is this type of old main pipe called and how do I connect to it?
2. Do I likely just need a standard 4" pipe into the septic tank?
3. How should I seal the pipe to the septic tank inlet (It goes thru a round hole that is roughly 4" but a bit larger)?
Thanks a lot
BasicPoke
![IMG_8824_25%.JPG IMG_8824_25%.JPG](https://cdn2.imagearchive.com/plumbingforums/data/attachments/2/2649-e760cc9c71ddf8a9131e93982287c3e7.jpg)
![IMG_8826_collapsed part.JPG IMG_8826_collapsed part.JPG](https://cdn2.imagearchive.com/plumbingforums/data/attachments/2/2650-622ad8af91e50c03da7d6e45de2cf30b.jpg)
![IMG_8828_25%.JPG IMG_8828_25%.JPG](https://cdn2.imagearchive.com/plumbingforums/data/attachments/2/2651-53e71421d9ba06f5cb79bad1071b68b2.jpg)
![IMG_8829_25%.JPG IMG_8829_25%.JPG](https://cdn2.imagearchive.com/plumbingforums/data/attachments/2/2652-8f33068a6b10e6ebe7be1acb1f9fa2bc.jpg)