Flange Gasket, Full Face, 3 in Pipe Size, 7 1/2 in Outside Dia., Bolt Holes 4, 3 1/2 in Inside Dia., Metal Detectable No, Material of Construction Aramid Fiber with Buna N Binder, 1/64 in Thickness, -100 Degrees to 400 Degrees Temp. Range (F), Color Blue, Standards ASME B16.21