I am remodeling a house I bought for my mother. She lived there 6 months last year and decided to move back to her home. Now, I am remodeling the basement to get it sold. I cut out the galvanized plumbing and some of the cast iron drain pipe this weekend. The cast iron pipe served the kitchen drain and a Y from it served the washing machine. The two drains are directly in sight of each other on oppisite sides of the house. I would like to run 1-1//2 PVC from the kitchen drain to a 2" tee to pick up the washing machine, then a trap and over to the main line. Will the trap cause troubles and not do it's job?