Double O-ring Centerseal. Two O-rings for positive sealing and plastic bearings for long life. World Class Diaphragm. High quality rubber compound, resistant to heat and cold. Superior flexibility even at -40F. Orange Alert Stroke Indicator. Self-piloting Dust Shield. Sizes to fit all drum brake applications. Superior Power Spring Technology. Advanced powder coating process. Resists corrosion and fatigue. Product Features:Heat treated power springs for maximum output force and extended life, powder coated for corrosion protectionAluminum center body is durable, lightweight and corrosion resistantDouble O-ring center seal and wears rings extend service life and protect against air leakage between chambers Patented orange alert stoke indicator is visible when brakes are out of alignmentEpoxy coated clamp band and service return spring for additional corrosion resistance
