Mturse
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Good evening. Located in new York, Been looking for an applicable post but I don't see any that apply. I need to tie in the 3 inch PVC seen n the picture into a cast iron horizontal run. I know that I need to add supports to the cast before I cut for all the extra weight, but my question is this, should I cut at the yellow lines in the attached photo and add a section of 4 inch PVC with wye to 3 inch up and if so, do I use a 4 inch PVC no hub adapters and use the 4 clamp shielded no hub adapters? Or can I just use the shielded 2 clamp no hubs that go 4 inch cast to 4 inch PVC?
2nd option , which sets me up for future, is cut at the blue lines, since the red arrow section will be replaced in a year to the old wc since it has a backwards pitch from settling. Then I can do all 3 inch and use a 4 inch to 3 inch bell reducer and 4 clamp 4 inch no hubs.eventually next year I will replace the red section when I pull the old toilet after the other bathroom is complete. Temporarily the vertical red 4 inch will reduce to 3 which is not optimal but it will be only for a year.
Hope it's clear enough and thanks in advance
Mike
2nd option , which sets me up for future, is cut at the blue lines, since the red arrow section will be replaced in a year to the old wc since it has a backwards pitch from settling. Then I can do all 3 inch and use a 4 inch to 3 inch bell reducer and 4 clamp 4 inch no hubs.eventually next year I will replace the red section when I pull the old toilet after the other bathroom is complete. Temporarily the vertical red 4 inch will reduce to 3 which is not optimal but it will be only for a year.
Hope it's clear enough and thanks in advance
Mike