I have a Kenmore Dishwasher 66516269400 of which I replaced the circulation pump and motor assembly. While I was taking out the water supply tube which goes up the back of the washer and along the top a small round plug (looks like a shirt button) with a point at one end fell onto the dishwasher bottom. I assume it came from the top of the arm. Where did that come from and what is its purpose. The only place I see that it can fit is in a hole at the end of the supply tube. Is that correct the correct place?
Mike