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. 4 in, Nominal Width 1/4 in, Actual Inside Dia. 3.9 in, Actual Width 0.275 in, Dash Number 421, Color Red, Durometer 70 Shore A, Meets/Exceeds , Nominal Outside Dia. 4 1/2 in, Actual Outside Dia. 4.525 in, Temp. Range -80 Degrees to 450 Degrees F, Yes