O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material Kalrez 4079 Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 2 5/8 in Nominal Width 1/8 in Actual Inside Dia 2.6 in Actual Width 0.139 in Dash Number 231 Color Black Durometer 75 Shore A Nominal Outside Dia 2 7/8 in Actual Outside Dia 2.887 in Temp Range 30 Degrees to 600 Degrees F FDA Approved No