GE cafe dishwasher around 5 yrs old-question about attaching drain hose (no model number anywhere)

[ktaylormusic]

I'm installing a used GE Cafe dishwasher - about 4-5yrs old, apparently. No model number to be found.

When I go to attach the drain hose, there is a threaded connector on the dishwasher side, but no threads on the rubbery black elbow connector on the hose side. This is making me wonder if there is a part missing here. I've attached pics of each side, as well as the whole bottom in case that helps anyone recognize the model.  It just seems odd to clamp this rubber hose end over a threaded mount, as if something else is meant to happen here and, if nothing else, be a source of leaks. Also, it notably says ON the drain hose "do not remove check valve", so I'm wondering if that's what's missing. 

Also, if anyone recognizes this model number, it would super help to have it if I need to buy a part!

Any help or guidance would be much appreciated.

 

[Vance R]

 Those are ribs or barbs that help to grip the hose when clamped in place. The check valve is usually built into the rubber elbow and not easily removed. For the model number it is usually located on the tub just outside the door gasket or on the door around the inner flange.