I took Bosch dishwasher home and did research on the noise and the check valve sounded like the problem. I order the check valve and installed it. Easy to do. Now I wanted to see if it fixed the problem before I take out my perfectly good dishwasher and install the Bosch. I found a dishwasher connector at Home Depot that made it easy to connect the Bosch to a garden house. Wired the Bosch to power and turned the dishwasher on. No noise and the dishwasher works. Not bad for just $12.