Plumber's Choice 93867 Gasket for Romac Series 501 Dresser Coupling for 3-Inch Copper Pipe, 3.29-Inch Gasket Internal Diameter (5-Pack)
The Aviditi 93867 Gasket for Romac Series 501 Dresser Coupling (93837AVI-) is used with 3-inch copper pipe and has a 3.29-inch gasket internal diameter.