FBU SEALS KSC stationary single seal is the standard cartridge mechanical seal for chemical and centrifugal pumps, designed for efficient OEM customers. Its stationary-face compensation technology keeps seal faces aligned under shaft run-out to extend service life and cut downtime. ISO 2858 compatible, shaft 24–100 mm, up to 20 bar and 150 °C, 316SS structure, 4-week lead time. A reliable packing-replacing upgrade. Specs, materials & FAQ.