Looks fine to me.....not sure what's up with the other posters....Sorry if not clear, this is for a clothes washing machine.
1) What would be the difference between a p trap and what I've got?
2) Why do I need a longer horizontal? I only have two stud bays to work in and I've already swept the washer box to the left as far as I could.
3) As for the 2" vent, it ties into a 3 above in the attic space. I've never had an issue with a 2' run in this manner. Out of a few homes and many washing machines, all have had a 2" vent at this point.
Thanks for your time!