Buy Caterpillar 5S7221 - INSERT (exhaust) at wholesale prices with easy payment and fast shipping options. Save up to 50% OFF OEM pricing. Compatible Machines:- ENGINE - MARINE Compatible Models:- 3304- 3306- D330C- D333C Units Containing The Spare Part :- CYLINDER HEAD AND VALVE MECHANISM (5S6444 N/S)--Side View--Part 1 of 2 (561C)- CYLINDER HEAD AND VALVE MECHANISM (1P6781 N/S)--Side View--Part 1 of 2 (D6C)- CYLINDER HEAD AND VALVE MECHANISM (9L4086 N/S)--Side View--Part 1 of 2 (1673C)- CYLINDER HEAD AND VALVE MECHANISM (7L403 N/S)--Side View--Part 1 of 2 (3304)- CYLINDER HEAD AND VALVE MECHANISM (7L340 N/S)--Side View--Part 1 of 2 (3304)- CYLINDER HEAD AND VALVE MECHANISM (7L518 N/S)--Side View-Part 1 of 2 (3304)- CYLINDER HEAD AND VALVE MECHANISM (1N7508 N/S)--Side View - Part 1 of 2 (3306)- CYLINDER HEAD AND VALVE MECHANISM--Side View--Part 1 of 2 (3304)- CYLINDER HEAD AND VALVE MECHANISM -- Side View--Part 1 of 2 (3304)- CYLINDER HEAD AND VALVE MECHANISM (8S6539 N/S)--Side View--Part 1 of 2 (980B)- CYLINDER HEAD AND VALVE MECHANISM (5S6687 N/S)--Side View - Part 1 of 2 (966C)- CYLINDER HEAD AND VALVE MECHANISM (1P6782 N/S)--Part 2 of 2 (D6C)