Does anyone know if there is a rebuild kit for the flow/deair pump head? I have checked with Fresenius they used to have one but no longer carry it.

FYI I just found this information. There is a company that will rebuild the Flow/Deair pump head for $212.00 each minus 10% if you send in three or more at a time. They will also sell a kit to rebuild it yourself for $121.00 each. The name of the company is Flo-Tech they are in Florida phone number is 1-800-335-6832

few more dollars and you can buy a new one from Fresenius and it will last twice as long as a flow tech rebuild......

I agree with pump head guy.
Replace with a new one and be done with it.
Unless you like unnecessary machine breakdowns......