TruePower 21-5551 Large Tail Pipe Expander (2.10" - 3.25" I.D.) Great Tool for perform exhaust systems repairs and installations Heavy Duty carbon Steel works on all thin wall pipes between Large size pipe expander works with all thin wall pipes between 2.10" - 3.25" (I.D.) A simple turn of the wrench expands and flares the pipe for pre-weld mating