What operating system are you using?
Maplin supply a box for this purpose, but make sure that you have the correct type before you buy. I have used this type of connection in the past, and had various good and bad results.
At present I am using 3 printers on my system. 2 usb inkjets and one parrallel laser, configured through XP printer set-up. Simple case of transfering from one printer to another at the click of the mouse.