280 Heavy Duty Dual Cartridge Seal Self-centering, self-aligning dual seal Vibration-isolated faces Tight concentric tracking for ideal face mating prevents wiping or run-out Ideal for viscous, sticky, or polymerizing fluid applications Exclusive, unrestricted dual balance for reliability even at elevated pressures ISO 9001:2000 CERTIFIED Upgrade to the new standard for reliability in heavy duty dual cartridge sealing