O-Ring, Black BUNA/NBR Nitrile Size: 904, Durometer: 90 Nominal Dimensions: Inner Diameter: 33/94(0.351) Inches (8.92mm), Outer Diameter: 49/99(0.495) Inches (1.2573Cm), Cross Section: 1/14(0.072) Inches (1.83mm) Part Number: OR90BLKBUN904