Not sure about the 280, but the 360 and 380 have a large white plastic nut that, once you push the hose onto the unit, screws on to keep it in place. I would assume the 280 should have this, too...
Janet
thanks, does the hose connect directly to the cleaner or is there a swivel that connects the hose to the unit and then the feed hose nut goes around the feed hose?