how rough in plumbing drain pipe
Watch this video to see some plumbing drain lines, but more importantly, lots of plumbing vent lines. Be sure you call out the size of each pipe shown on your rough-in plumbing diagram. Show all changes of direction correctly. If you intend to use a fitting that turns a hard 90-degree angle, show that on your drawing. If you intend to use fittings that turn just 45 degrees, draw that acute angle on the paper.