O-Ring FEP with Viton Core AS568 Dash Number 445 Actual Width 0.275 In. Actual Inside Dia 7.975 In. Outside Dia 8.525 In. Cross Section Shape Round Durometer Rating Hard Durometer 90 Shore A Nominal Width 1/4 In. Nominal Inside Dia 8 In. Nominal Outside Dia 8-1/2 In. Color Clear with Black Core Temp Range -75 Degrees to 400 Degrees F Meets/Exceeds ASTM D2116