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 3 5/8 in Nominal Width 3/16 in Actual Inside Dia 3.6 in Actual Width 0.21 in Dash Number 342 Color White Durometer 55 Shore D Nominal Outside Dia 4 in Actual Outside Dia 4.02 in Temp Range -300 Degrees to 500 Degrees F FDA Approved Yes Package Quantity 2