Ring Flange Gasket, Gasket Material PTFE, Insert Material Aluminosilicate Microspheres, For Pipe Size 4 in, For Flange ANSI Class 150, Binder Material None, Color Blue, Inside Diameter 4 1/2 in, Minimum Operating Temperature -450 Degrees F, Maximum Operating Temperature 500 Degrees F, Outside Diameter 6 7/8 in, Thickness 1/16 in, Gasket Type Ring Gasket, Metal Detectable Gasket No, Included Fasteners Not Applicable, Hardness Not Rated, Includes Mounting Hardware No, X-Ray Detectable No