The Fittings | O-ring, FKM (ø85×4 mm) is a precision-molded fluorocarbon (FKM/Viton) sealing ring designed for high-temperature, chemically resistant connections in wiped-film distillation and botanical extraction systems. With an outer diameter of 85 mm and a cross-section of 4 mm, this O-ring provides a reliable, leak-free seal in VTA and UIC distillation equipment and compatible laboratory apparatus. FKM material offers outstanding resistance to heat, vacuum, and a broad range of solvents and oils encountered in short-path and thin-film distillation. Sold individually; compatible with standard groove dimensions for the specified ring size.