Used for petroleum based fuel/oil, water, alcohol, some acids and bases. Temperature range -55oC to 120oC. Buna N-70R Nitrile Durometer A. Conforms to ASTM D2000 M2BF714, B14, EA14, EF11, EF21, EO14 & EO34. Industry Number: 325, Thickness: 3/16", Inside Diameter: 1-1/2", Outside Diameter: 1-7/8" Material: Buna N-70R Nitrile Durometer A. Type: S.A.E. Reference Number: 325. Inside Diameter: 1-1/2". Outside Diameter: 1-7/8". Thickness: 3/16".