This modification is equally applicable to the Epson Stylus Photo 1280
There has been a reasonably useful guide for modifying this printer on InkRepublic but unfortunately it was a bit too easy to try to identify and remove the wrong waste tube end.
As the original images belong to Ink Republic you will still need to refer to the original guide here:
http://www.inkrepublic.com/KnowledgeBase/1280WasteInk.asp
… but the images below should ensure you identify the correct waste tube.