Here you go chip http://shop.autobritedirect.co.uk/pr...ances-15-c.asp just tell them you have a karcher and they will sort out the correct fitting,theres loads of foam to choose from,i use autobrights supa snow foam goes on realy thick and clings realy good,5ltrs will last a very long time as you only need about 1" in the bottle and fill the rest with water