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 7/16 in Nominal Width 1/8 in Actual Inside Dia 1.421 in Actual Width 0.139 in Dash Number 221 Color Black Durometer 70 Shore A Meets/Exceeds 21CFR177.2600 ASTM D2000 NSF Standard 61 SAE J200 Nominal Outside Dia 1 11/16 in Actual Outside Dia 1.699 in Temp Range -40 Degrees to 250 Degrees F