O-Ring, No Metal Detectable, No X-Ray Detectable, System of Measurement Inch, Cross Section Shape Rectangular, O-Ring Material Buna N, Durometer (Hardness) Rating Medium Hard, Nominal Inside Dia. 3 3/8 in, Nominal Width 1/8 in, Actual Inside Dia. 3.3 in, Actual Width 0.139 in, Dash Number 237, Color Black, Durometer 70 Shore A, Nominal Outside Dia. 3 5/8 in, Actual Outside Dia. 3.637 in, Temp. Range -40 Degrees to 250 Degrees F, FDA Approved No, Properties Resistant to Oils, Resistant to Water