203 Buna/NBR O-Ring AS568A 90A Durometer Black ID: 5/16in, OD: 9/16in, CS: 1/8in, 3000PK
â¢Made of Buna-nitrile (also called Buna-N) for use with a variety of fluids and hydrocarbonsâ¢These versatile o-rings perform well in petroleum based oils & fuels, aliphatic hydrocarbons, vegetable oils, silicone oils & greases, ethylene glycol, dilute acids, and water to below 100°C (212°F)â¢Durometer (hardness) of 90A for resistance to penetration.