Small Engine Problems? Ask an Engine Mechanic for Answers ASAP
I believe this is what you are looking for.
What i ask for is extention hose, not repeat not a replacement hose;this hose above quoted by you is readely available on the web most of outlet.PJ.
This one is listed by Karcher as an extension hose http://www.karcher.com/int/Products/Home__Garden/Water_Blasters/Machines/Medium_class/16374000.htm?&sdp=ac&pid=26417100&accessoriesGroupName=&pn=XH+10+Q%2C+Extension+Hose+Quick+Connect&title=XH+10+Q%2C+Extension+Hose+Quick+Connect
This place shows they have them in stock. http://www.cleanstore.co.uk/products/Product.asp?ID=4429