FRAM CAK530 Heavy Duty Air Filter Many have self-spaced pleats (SSP) technology to eliminate pleat bunching and provide uniform pleat spacing for even distribution of contaminant and extended filter life High quality urethane gaskets to ensure superior filter-to-housing seal Radial seal designs utilize urethane that has the perfect balance between rigid and soft to ensure a perfect seal while maintaining ease of installation For both on and off highway applications Traditional and Radial Seal Designs