O-Ring Silicone AS568 Dash Number 461 Actual Width 0.275 In. Actual Inside Dia 15.955 In. Outside Dia 16.505 In. Cross Section Shape Round Durometer Rating Medium Hard Durometer 70 Shore A Nominal Width 1/4 In. Nominal Inside Dia 16 In. Nominal Outside Dia 16-1/2 In. Color Red Temp Range -65 Degrees to 450 Degrees F Meets/Exceeds SAE J200 ASTM D2000 FDA Approved