I use standard Fuss-tool hoses (27mm), which are a bit of a tight "forced" fit over the dust port. At least it doesn't come off inadvertently.

When it's available I actually prefer to use a smaller, lighter, thinner and weaker but infinitely more flexible Metabo/Bosch hose, which is an easy but secure push fit. The other end of the hose attaches to a standard Fuss-tool 36mm hose end using a half dozen turns of duct tape as an adaptor. The 2 hoses combined gives me a combined reach of 7 or 8 metres, and is a superior ergonomic match to the lovely flexible "floppy" rubber power cable fitted to the sander: so much easier to handle & manoeuvre than the cheap & nasty stiff PVC cables fitted to lesser tools.

The only downside is that the lighter hose tends to kink or fold over itself if not sensitively handled. It's upside is that it only costs about $50 odd, or did several years ago when I bought mine. It's also an easier & more convenient push fit over my Bosch Delta sander's dust port too.