Re: LES...GREENIE.... RICHARD...NEED TO ASK YOU A QUESTION??????
If you don't mind some cutting....why not.
If memory serves, the 405 tank has a 3" port, and two 2" flow-ezy filters, so there is gonna be a fair bit of resistance.
Doesn't mean you can't do it, heck just a 4" to 3" rubber FernCo would do the trick.
That said....in a box, why not keep the monster tank, or are you giving up Drying Equip. room?