O-Ring, Black Aflas Size: 261, Durometer: 80 Nominal Dimensions: Inner Diameter: 6 69/94(6.734) Inches (17.10436Cm), Outer Diameter: 7 1/83(7.012) Inches (17.81048Cm), Cross Section: 5/36(0.139) Inches (3.53mm) Part Number: OR80AFL261