Yep. I do that all the time to attach a Festool hose to my DX-93 sander which also has an oval port, as does the 1010 router. That elastomeric fitting can also be stretched a bit to fit over some (round) ports that are of larger diameter than Festool uses. I frequently attach my 36mm AS hose to the DC port of my JoinTech hollow aluminum table saw/router table fence.
Dave R.