The Dichtomatik OR 3.987" is a high-quality O-ring made from 90 NBR (Nitrile Butadiene Rubber), designed for reliable sealing in various industrial applications. With a cross-section of 0.103", this O-ring ensures a tight fit and excellent resistance to oils and fuels. It meets industry standards for durability and performance, making it suitable for use in hydraulic and pneumatic systems. The dimensions are precise, ensuring compatibility with standard fittings. Ideal for use in automotive, aerospace, and manufacturing sectors, this O-ring is a dependable choice for maintaining system integrity.