Terry ~ Iam a newbie at this in many ways!
I am in the midst of remodeling a cottage and a contractor started my plumbing but when things got a "little" tough baled for another job... I knew I only had them for a short time.
Anyway, I need to tie in the kitchen drain to my main sewer line under the house. The main sanitary "T" sits up a little high making it tough to get the right pitch with the floor joists in the way. My main line is about 20"