I just got a snow foam lance from CYC with the Karcher fitting to use with my K series Karcher. The problem I have is that it won't seal at the fitting between the lance and the Karcher. It goes on like all the other Karcher fittings no problem but when I try to use it its just sprays water out of the joint and doesn't allow any foaming action. All my other Karcher fittings work fine?? Am I doing something wrong??