Quad Ring, Black Viton/FKM Size: 121, Durometer: 75 Nominal Dimensions: Inner Diameter: 1 2/41(1.049) Inches (2.66446Cm), Outer Diameter: 1 13/51(1.255) Inches (3.1877Cm), Cross Section: 7/68(0.103) Inches (2.62mm) Part Number: XP75VIT121