OK; read all the posts and exposed my 4" iron pipe sewer line as close to the house as I can get- about 3 ft. Ready to cut the pipe and install a combination wye and 1/8 bend but first two questions: 1. Is it really worth all the trouble to double the wye to provide access to the portion of the line between the c/o and the last access point inside the house (a toilet)? 2. Is there any reason to use iron for the wye, or can I use PVC with the no-hub couplings discussed elsewhere?
Any other suggestions or notes before I get going?
Many thanks and best regards,
Skip.

Hey Skip,
What, exactly, are you attempting to accomplish? Is there a CO in place already? Are you settingup to snake against the flow from outside to the toilet? Please explain in detail. Regards, tom

No, there's no external cleanout in this sewer line so I want to install one to provide access to the 50-60 ft run to the county sewer (street). Run becomes clogged with roots about annually, the last several years and each time I pay the rooter guy several hundred $$ to get up on the roof to rooter the run from the nearest access point, a vent line. So, the question is, just install a standard cleanout (single direction wye) pointing downstream, or go to the additional trouble and expense of installing a 2 way access point such as a Texas twin or equivalent. Since there aren't many blockage points between the planned location of the new cleanout and the fixtures in the house, I'm inclined to use a simple one-direction cleanout, pointing downstream and deal with any upstream issues through the in-house access points as necessary. However, material of the wye is still a question. Iron is a lot more expensive but would maintain the material of the sewer line, while PVC is cheap and readily available locally. I assume recommendation is to use no-hub fittings with couplings.
Thanks,
Skip.

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I'm inclined to use a simple one-direction cleanout, pointing downstream and deal with any upstream issues through the in-house access points as necessary.

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I agree, snaking against the flow is never a good idia.
I would cut in a PVC combination wye and eighth bend and bring it up to grade with a clean out fitting. Glue a short piece of PVC in the hub to pick up the No-Hub band when uou connect to the cast iron.

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The Run becomes clogged with roots about annually,

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Let me helps with the roots. Going in, let me say that sooner or later you're going to have to bite the bullet and replace that old sewer line with PVC. If you wish to control roots RootX or Robics Foaming Root Killer that contain Dichlobrnic are two products you could try.
A less expensive way would be to call around to garden supply stores and ask for fine grain Copper Sulphate. Put a 1/2 pound in your toilet and flush it down. Repeat in 6 months.
Hope this helps and thank you for rating my answer, Tom