MCMASTER-CARR® O-Ring, Oil-Resistant, Dash Number: 054, 6-1/4 in Inside Dia, 6-3/8 in Outside Dia, 1/16 in Width, Buna-N Rubber, 70A Durometer, Round Cross Section, Durometer 70A Hardness, -20 to 250 deg F, For Use With: Acetic Acid, Ammonia, Ammonium Hydroxide, Animal Oils, Bases, Boric Acid, Butyl Alcohol, Calcium Hydroxide, Citric Acid, Ethanol, Ethylene Glycol, Glycerin, Grease, Hydraulic Oils, Isopropyl Alcohol, Methanol, Mineral Oils, Motor Oil, Petroleum Fluids, Phosphoric Acid, Potassium Hydroxide, Sodium Bicarbonate, Vegetable Oils, Water, Black