I kept trying to put the cap back on with every wash hoping it would stay on. I didn't know what its purpose was but I thought it might be important. Anyway, I waited and kept putting it back on until one day I just started using the machine without the part. Then I looked up the Samsung model and found Appliance Parts Pros.com There was a picture of the part and others who had ordered and installed the piece. I ordered it on Monday and it was here on Tuesday Fedex. I didn't choose next day service, but did pay for 2 to 5 day service. I was so suprised when it arrived. I snapped it on and viola! it is good as new. What a great experience.