O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material EPDM Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 1 3/8 in Nominal Width 1/8 in Actual Inside Dia 1.359 in Actual Width 0.139 in Dash Number 220 Color Black Durometer 70 Shore A Meets/Exceeds 21CFR177.2600 ASTM D2000 NSF Standard 61 SAE J200 Nominal Outside Dia 1 5/8 in Actual Outside Dia 1.637 in Temp Range -65 Degrees to 300 Degrees F