I've just bought one of these from a lad in Hull for £95, and it turns out he's got another up for grabs, so I thought I'd let you all know in case it would be useful for someone for a vacuum fixture. 3 phase 1.5KW@ 50Hz but should do -425mbar and 140ish m3/hr if you run it off a VFD and tweak the rpm up. PM me if interested and I'll give you the contact details.