O-Ring, Black Viton/FKM Size: 008, Durometer: 75 Nominal Dimensions: Inner Diameter: 3/17(0.176) Inches (4.47mm), Outer Diameter: 6/19(0.316) Inches (0.316mm), Cross Section: 4/57(0.07) Inches (1.78mm) Part Number: ORVT008