O-Ring, Black Viton/FKM Size: 109, Durometer: 75 Nominal Dimensions: Inner Diameter: 29/97(0.299) Inches (7.59mm), Outer Diameter: 50/99(0.505) Inches (1.2827Cm), Cross Section: 7/68(0.103) Inches (2.62mm) Part Number: ORVT109