Hi Wade,?
At the risk of making a broad, definitive statement, I will say that it has been my experience that all of the European hoses and vacs that I've used conform to the standard 50mm vac-end connection, with the exception of the Starmix hoses, which are only compatible with Starmix vacs, but the Starmix vacs will accept any 50mm hose end.?
In terms of vacs, at this point I've consolidated down to re-branded Starmix vacs (Metabo, Mafell, etc....), and Nilfisk vacs.
So, until Festool converts to a proprietary vac/hose connection, their vacs should be compatible with any brand hose with a 50mm cuff/end.
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Tom Gensmer
Heritage Home Renewals, LLC
Minneapolis, MN
Tom Gensmer