Need correct model no really, it is on label on inside of door . The fact you are asking indicates it is not easy so I think you have the one where it joins onto a tubular anti syphon box you can see this if you take the lid off. If so the hose is a push fit but it is locked in by the syphon box fixing, you need to pull up the syphon box on its top mounting and release it from the cabinet by pushing towards the drain hose then you can release its grip in the grooves of the drain hose. If you dont have this type give me model no and I can help. Cheers
Kenjo
May 2012