Will My Trap Arm Block the Dishwasher? (plumbing101.i234.me) When designing a new kitchen, plumbing layout can raise tough questions. Many homeowners ask if the trap arm that runs from the wall to the sink could block a dishwasher from sliding into place. Question: If the trap arm comes out of a 2×4 exterior wall and runs… Continue reading Will My Trap Arm Block the Dishwasher?