Ordered the tube and the spray arm. They simply attach to the top rack. No tools required. The tube simply clips onto the rack, and the spray arm simply twist locks on the tube. Took me all of five minutes. Works perfectly. Parts fit perfectly. On the old tube, the hole that meets up with the tube in the back of the dishwasher had worn out. Therefore, I was not getting good water pressure to the tube and arm. This took care of that problem.