O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material PTFE Durometer (Hardness) Rating Very Hard Nominal Inside Dia 2 7/8 in Nominal Width 3/16 in Actual Inside Dia 2.85 in Actual Width 0.21 in Dash Number 336 Color White Durometer 55 Shore D Nominal Outside Dia 3 1/4 in Actual Outside Dia 3.27 in Temp Range -100 Degrees to 500 Degrees F FDA Approved Yes Package Quantity 2