As MattB wrote--the inlet/outlet tubes are easy to solder--just one caution--avoid the temptation to solder it in place. Remove the radiator so it can be flushed thoroughly. It may pay to heat it enough to remove the tube altogether for the most thorough cleaning but I've had good results spraying the crack with a solvent and blowing dry with compressed air on the bench and then proceding with the torch and solder. -- Dave