O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material Buna N Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 2 1/2 in Nominal Width 3/16 in Actual Inside Dia 2.475 in Actual Width 0.21 in Dash Number 333 Color Black Durometer 70 Shore A Meets/Exceeds ASTM D2000 SAE J200 Nominal Outside Dia 2 7/8 in Actual Outside Dia 2.895 in Temp Range -40 Degrees to 250 Degrees F FDA Approved No