O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material FEP with Silicone Core Durometer (Hardness) Rating Hard Nominal Inside Dia 2 1/4 in Nominal Width 3/16 in Actual Inside Dia 2.225 in Actual Width 0.21 in Dash Number 331 Color Clear with Red Core Durometer 85 Shore A Meets/Exceeds ASTM D2116 Nominal Outside Dia 2 5/8 in Actual Outside Dia 2.645 in Temp Range -75 Degrees to 400 Degrees F FDA Approved Yes