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. 1 7/8 in, Nominal Width 3/16 in, Actual Inside Dia. 1.8 in, Actual Width 0.21 in, Dash Number 328, Color Black, Durometer 50 Shore A, Nominal Outside Dia. 2 1/4 in, Actual Outside Dia. 2.27 in, Temp. Range -40 Degrees to 250 Degrees F, No, Properties to Oils, to Water