Re: trap size for water closets
Posted by Gary Swartg on March 27, 2002 at 15:48:40:
In response to Re: trap size for water closets

I can't answer the "why" of your question, but 3" is enough drain size for a toilet. The trap itself in part of the toilet. I understand the sizes may vary a little, but the 2" glazed ceramic is the best size. The drain from the closet bend to the main sewer line must have a 1" per 4' slope. Over 6 feet must be vented. Some drains are 4", which is fine although larger than really needed.

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