The Freudenberg-NOK Dichtomatik OR 3.859" 90 FKM V901W is a premium O-ring made from FKM (Fluoroelastomer), known for its exceptional resistance to high temperatures and aggressive chemicals. With a cross-section of 0.139" and a hardness of 90, this O-ring is perfect for demanding applications in the automotive and chemical industries. Its robust construction ensures a reliable seal, while its compliance with industry standards guarantees compatibility with various systems. Ideal for high-performance environments, this O-ring is a reliable choice for engineers and technicians.