O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape X O-Ring Material Buna N Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 2 1/4 in Nominal Width 1/8 in Actual Inside Dia 2.234 in Actual Width 0.139 in Dash Number 228 Color Black Durometer 70 Shore A Meets/Exceeds ASTM D2000 SAE J200 Nominal Outside Dia 2 1/2 in Actual Outside Dia 2.512 in Temp Range -40 Degrees to 250 Degrees F FDA Approved Yes Package Quantity 25