I have a sewer latteral to run this week for another builder/friend of mine and he wants me to put the clean out in the crawl space. I always put the clean out out side about two foot away from the foundation using a wye and a 45. I do not like placing it in the basement or crawl space because if you have a blockage and have to use the clean out you end up with a crawl space full of **^% and you have to drag your clean out snake to the crawl space. So I am just curious what most of you guys like?