O-RING, NOT METAL DETECTABLE METAL DETECTABLE, NOT X-RAY DETECTABLE X-RAY DETECTABLE, SYSTEM OF MEASUREMENT INCH, CROSS SECTION SHAPE ROUND, O-RING MATERIAL FEP WITH SILICONE CORE, DUROMETER (HARDNESS) RATING 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 CLEAR WITH RED CORE, DUROMETER 85A, MEETS/EXCEEDS ASTM D2116, NOMINAL OUTSIDE DIA. 3 1/4 IN, ACTUAL OUTSIDE D