O-Ring, No Metal Detectable, No X-Ray Detectable, System of Measurement Inch, Cross Section Shape Round, O-Ring Material Silicone, Durometer (Hardness) Rating Medium Hard, Nominal Inside Dia. 3 1/8 in, Nominal Width 3/16 in, Actual Inside Dia. 3.1 in, Actual Width 0.21 in, Dash Number 338, Color Red, Durometer 70 Shore A, Meets/Exceeds ASTM D2000 -VQM 70, FDA 21 CFR 177.2600, Nominal Outside Dia. 3 1/2 in, Actual Outside Dia. 3.52 in, Temp. Range -65 Degrees to +400 Degrees F, FDA Approved Yes