one more Drainvac model
I forgot to mention the Drainvac Atomik. You can connect it to pipes but it's also designed to be portable. You can actually use any central vacuum unit without pipes by just attaching a utility valve to the in-take but this one is very easy to carry around. I also have this unit and it's really good, though the water lift is a bit low for a central vacuum unit.
Mike
[URL unfurl="true"]https://www.thinkvacuums.com/drainvac-atomik6-30-portable-system-w-accessory-kit.html[/URL]