Yersmay
Writing, constructionDIY Member
I am installing a new tub. The sewer line and hookup is new also... The waste and overflow items are joined together by a 1 1/2 inch San Tee. The trap is positioned directly beneath... The trap arm (horizontal piece after the P trap) will be connected to a nearby 2 inch comby which is part of the main 4 inch drainage line. I am assuming it would be a good idea to increase the drain size from 1 1/2 to 2 inches BEFORE the trap, rather than increasing the pipe size in the trap arm. Correct? Thought I'd better ask just in case there's some wrinkle to this I would never have anticipated. Thank you in advance!