Fel-Pro Exhaust Pipe Flange Gasket - 23561 Part #: 23561 Line: FEL Fel-Pro Exhaust Pipe Flange Gasket 1 Year Limited Warranty Port Shape: Round Style: Flat Inside Diameter (in): 1-3/4 Inch Outside Diameter (in): 2-1/4 Inch Thickness (mm): 5mm Thickness (in): 3/16 Inch Number Of Bolt Holes: 0 Number Of Port Holes: 1 Show More Show Less