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joethebuilder
Replacing old CI

I am replacing 40 year old 4" CI DWV lines in basement with new PVC. Is it better to stay with 4" or is 3" OK? Also I wanted to use two T fittings from the toilets instead of wye fittings to keep it above the ceiling, the job is not being inspected, will this work or do i need to use wye fittings? Thanks for your help joethebuilder.

canuk
Re: Replacing old CI
joethebuilder wrote:

I am replacing 40 year old 4" CI DWV lines in basement with new PVC. Is it better to stay with 4" or is 3" OK? Also I wanted to use two T fittings from the toilets instead of wye fittings to keep it above the ceiling, the job is not being inspected, will this work or do i need to use wye fittings? Thanks for your help joethebuilder.

Wye fittings

Re: Replacing old CI

If there is 4" above the pipe your replacing you have to use 4" as you cannot reduce a drain and I don't have enough information about your system to give you a definitive answer. Tee fittings are used on vertical pipe, wye's on the horizontal.

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