Does anyone have a source for the large O-ring that goes on the front of the K machine blood pump motor?

We had a new tech changing motors, and he didn't realize that the O-ring needed to be moved over to the new motor until the trash had been collected.

Fresenius doesn't seem to have it. I don't know if it really matters, but I would like things to be right.

Thanks.

Not sure if the o-ring makes a difference, in the process of replacing a blood pump motor I noticed the old motor was missing this o-ring, further research indicated the machine had about 5K from 1st replacement. If your still anting to replace, check and see if an air seperator (cover to body) o-ring will work (p/n: 646835).