O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material Viton Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 3 5/8 in Nominal Width 3/16 in Actual Inside Dia 3.6 in Actual Width 0.21 in Dash Number 342 Color Black Durometer 75 Shore A Meets/Exceeds ASTM D2000 SAE J200 Nominal Outside Dia 4 in Actual Outside Dia 4.02 in Temp Range -15 Degrees to 400 Degrees F FDA Approved No Package Quantity 2