O-Ring, Black BUNA/NBR Nitrile Size: 473, Durometer: 90 Nominal Dimensions: Inner Diameter: 23 47/50(23.94) Inches (60.8076Cm), Outer Diameter: 24 24/49(24.49) Inches (62.2046Cm), Cross Section: 11/40(0.275) Inches (6.99mm) Part Number: OR90BLKBUN473