Here we have a 3" abs line coming from the second floor of a home, tying into the 4" drain lines for the rest of the house. There is a 4" clean out in the back of the 4" wye. Is this ok? Or does the 3" line need an additional clean out? We go by UPC code here and from my understanding you don't need a clean out if the horizontal line is less than 5'. I guess I'm not exactly sure about this 5' rule. Can someone clear this up for me? The 3" horizontal line in the picture is about 2' and the pic is in the crawl space.