Actually you're wrong, I am a mechanical engineer and design plumbing systems, the larger the pipe, the better, sanitary pipes are not under pressure, they are gravity. Code minimum is 3" for all water closets in every town I've worked for, older water closet installations usually have 4", which is what I always call for.
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Actually you're wrong, I am a mechanical engineer and design plumbing systems, the larger the pipe, the better, sanitary pipes are not under pressure, they are gravity. Code minimum is 3" for all water closets in every town I've worked for, older water closet installations usually have 4", which is what I always call for.