The drain continues out of the 90 degree sanitary tee through a short piece of PVC pipe to a conventional 45 degree elbow and a street 45 degree elbow ("street" refers to a elbow that can connect directly inside another elbow or other connector. These inturn connect via a short pipe to a 90 degree elbow that takes my drain down around the venting for the furnace and water heater. This pattern continues all the way to the main drain waste vent pipe, all the while keeping the horizontal runs on the pipe on the required 1/2 inch per foot fall. IMG 2468
