Got a sealing job that needs a tough, flexible gasket? This nitrile rubber O-ring could be your fix. It measures 300mm in outer diameter, 288.6mm inner diameter, with a 5.7mm thickness — a solid metric size for various industrial, automotive, or plumbing applications. Made from NBR (nitrile rubber), it resists oil, fuel, grease, and abrasion pretty well, making it great for engines, pumps, valves, or machinery. It stays flexible under pressure and handles a range of temperatures. Just note, it's not ideal for ozone-heavy environments or strong solvents. Whether you're repairing equipment, sealing a flange, or doing DIY projects, this single O-ring offers a reliable, durable seal. Keep one on hand for when you need a quality rubber gasket that won't let you down.