O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material Silicone Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 3 3/4 in Nominal Width 3/32 in Actual Inside Dia 3.737 in Actual Width 0.103 in Dash Number 154 Color Red Durometer 70 Shore A Meets/Exceeds ASTM D2000 FDA Approved SAE J200 Nominal Outside Dia 3 15/16 in Actual Outside Dia 3.943 in Temp Range -65 Degrees to +400 Degrees F FDA Approved Yes