This Mr. Gasket triangle Exhaust Header Collector Gasket has a 3 inch pipe diameter and is made of copper. .
Mr Gasket 7177C Copper Seal Collector And Header Muffler Gasket
Mr. Gasket 7177C Copper Collector Gasket, 3 inch
Copper Collector Gasket 3x3 5/8 MR. GASKET 7177C