Nickson Exhaust Pipe Connector Gasket - 31564 Part #: 31564 Line: NIC Nickson Exhaust Pipe Connector Gasket Manufacturer's Defect Warranty Material: Steel Style: Flat Inside Diameter (in): 3/4 Inch Outside Diameter (in): 1-1/2 Inch Bolt Hole Diameter (in): 3/8, 1/2 Inch Number Of Bolt Holes: 2 Bolt Hole Center To Center (in): 1-5/8 Inch Number Of Port Holes: 1 Show More Show Less