The FKM O-ring 71×5 mm is a precision-molded FKM (Viton) O-ring sized 71×5 mm for sealing flanged, threaded, or grooved connections on VTA, UIC, GEA, and associated distillation and extraction equipment. FKM material provides exceptional resistance to high temperatures, vacuum, and the solvents, oils, and botanical extracts encountered in short-path and wiped-film distillation. Sold individually; confirm the groove dimensions before ordering to ensure correct fit.