INDUSTRIES FIRT 2.9" XTREME DUTY 304SS FLEX JOINT DESIGNED TO PERFECTLY FIT 2.75" CAST STAINLESS SCHEDULE 10 PIPE, NO NEED TO USE A SLOPPY 3" BELLOW NO LONGER, THESE ARE THE SAME BELLOWS WE USE ON ALL OF OUR FABRICATION THAT HAVE HELD OVER 100PSI EXHAUST BACK PRESSURE