Peter wrote:

Didn't PF go bust recently, or was it some dual-vac pump company?

You're probably thinking of Aero-Advantage, which marketed a dual-rotor vacuum
pump. It was recently the subject of an AD requiring removal of installed pumps.
I have one, it will be removed at the next annual in October. Too bad. I think
it was a nice unit, but Aero-Advantage didn't have deep enough pockets to
maintain the certification in the face of reports of short service life in some
installations, IIRC.

Dave